ads layout manual

7/22/2019 ADS Layout Manual

1/342

ADS Layout for

ADS users

Student Manual

Agilent TechnologiesTest & Measurement

Education Services

H7212A #224


2/342


3/342

ADS 1.5 Layout Training

ADS Layout Basics 1-1

Layout Window

Layer 1-2

Options > Layers

Layer Information

Drawn Shapes on Layers

Drawing Techniques 1-5

Drawing FeaturesEdit > Modify Commands

Edit > Vertex Commands

Measuring Objects

Drawing Operations 1-12

Selection Filters

Editing Commands

Merging

Boolean Logic

Scaling

Oversizing

Ground Plane Clearance

Positioning of objects


4/342

More Editing Commands

Information Commands

Design Rule Checker & custom DRC

Custom DRC

Custom DRC: Rule File

Layout Rules

Element Layers definition

Layout objects:Paths, Wires and Traces 1-23

Electrical/Physical Representation of Elements

Paths, Wires and Traces


Trace and Path Attributes

Easier Path/Trace Creation

Electrical/Physical Representation of Elements

Trace/Path/Wire Conversion

Transmission Lines

Schematic/Layout Preferences 1-30

Options>Preferences

Preferences Settings

Preferences: Grid/Snap tab

Preferences: Trace and Placement tabs

Preferences: Entry/Edit tab


5/342

Preferences: Unit & Layout Units tabs

Preferences Pin/Tee

Design synchronization 1-35

Design Representation

Design Representation Condition

Design Representation: Symbol

ADS Layout Window

Entry/Edit Settings

Update Layout, Update Schematic

Synchronization Problems

Synchronization Solutions

Variable Usage:

parameterized component,parametric sub-network, hierarchy 1-40

Design File contents

AEL File

Design Definition

Sub-networks

Options > Variables

Parametric sub-network

Creation and use of Fixed artwork 1-49

No Artwork

Artwork


6/342

Fixed Artwork

Custom Fixed Artwork packagesMake it available for CUSTOM, site customization

Custom Fixed Artwork packagesAdd it to the drop down list, with CUSTOM, site customization

Custom Fixed Artwork packagesMake it available for HOME, user customization

Custom Fixed Artwork packagesAdd it to the drop down list, with HOME, user customization

Built-in AEL artwork macros 1-59

AEL macro artwork

List of AEL macros

SMT_Pad component

How to use a built-in AEL artwork

Graphical Cell Compiler (GCC) 1-63

GCC: Introduction

GCC: How to build a PAM

GCC: How to build a PAM, Step 1




GCC: How to build a PAM, Step 5&6


7/342

Using Momentum Simulator 1-68

What is Momentum?

Momentum & Momentum RF Differences

Major Benefits of Momentum

Major Features of Momentum

Momentum Process

1) Create a physical design

2) Momentum or Momentum RF mode

3) Define the substrate characteristics

4) Solve the substrate (Optional)

5) Assign port properties

7) Set up and generate mesh

7) Set up and generate a circuit mesh

8) Simulate the circuit

9) View the results

Data conversion to .sNp file

Using the .sNp file

Momentum Optimization

Momentum Optimization,1. Create the design

Mom Optimization,2. Define parameter

Momentum Optimization,3. Define the goals


8/342

Momentum Optimization,4. Run the simulation

Momentum Optimization,5.1 Viewing the results



Momentum Optimization,

5.4 Viewing the results

Momentum Optimization,6. Improving the filter

Other Features: Make bridge and via

Importing and Exporting Files 1-86

Layout Export consideration

Available File Formats

Importing a Layout

Exporting a layout

Importing and Exporting Files:Drawing Exchange Format: DXF 1-90

Drawing Exchange Format: DXF

Importing DXF (hierarchical) files

Importing DXF (hierarchical) Options

Importing DXF (hierarchical): Mapping DXF to ADS

Exporting DXF (hierarchical) Options


9/342

Exporting DXF (hierarchical): Mapping ADS to DXF

Exporting DXF (flattened) Files

Exporting DXF (flattened)

Exporting DXF (flattened) Options

Exporting DXF (flattened): Mapping ADS to DXF

Example of DXF format

Importing and Exporting Files: GDSII Stream File 1-106

GDSII Stream File

GDSII Stream File: Mapping table

Importing GDSII Stream File: Guidelines and considerations

Importing GDSII Stream File:

Importing GDSII: Options

Exporting GDSII Guidelines and considerations

Exporting GDSII: Options

Example of GDSII format

Importing and Exporting Files: Gerber Artwork Translator 1-121

Gerber Artwork Translator & Gerber viewer

Gerber Artwork Translator:Limitations and Considerations

Exporting Gerber Files:

Exporting Gerber Files:Gerber File options


10/342

Exporting Gerber Files:Translation Settings

Exporting Gerber Files:Edit Apertures

Exporting Gerber Files: Edit Apertures

Exporting Gerber Files: Drill File

Exporting Gerber Files:Export Gerber Options

Exporting Gerber Files: Types of photo plotters

Exporting Gerber Files:Consideration

Example of Gerber format

Supplemental Layout Enhancement Info: ADS 2001 1-140

Content

Easy Grid Settings

Chop Command

Extend Command

Crop Command

Split Command


11/342

Labs

Lab 1: Layout Basics 2-1

Lab 2: Layout objects, Paths Traces, etc 3-1

Lab 3: Setting preferences, Design synchronization 4-1

Lab 4: Variables 5-1

Lab 5: Creating Component Artwork 6-1

Appendis for Lab 5 7-1Lab 6: Built-in AEL Macro 8-1

Lab 7: AEL Artwork Macro 9-1

Lab 8: Graphical Cell Compiler 10-1

Lab 9: Using Momentum simulator 11-1

Lab 10: Import and Export of Files 12-1

Appenis A: Theory and other Topics 13-1


12/342


13/342

1 - 1

2001 Agilent Technologies

Speaker Name

Speaker Title

11 April, 2000

ADS Layout Basics

Title of Presentation

5 December 2001

Agilent Restricted Page 2

Drawing

toolbar

buttons

Activate &

deactivate

buttons

Toolbar Viewing

buttons

Snap toolbar

buttons

Selected

object

Component

Palette

Components

available in

palette

Toolbar Editing

buttons

Other buttonsMenus

Layout Window


14/342

1 - 2



5 December 2001


Name and color of

current layer

Current layerComponent

historyName of project

and design

Absoluteco-ordinates

Relativeco-ordinates

Prompt

Layout units Type of

design

Simulated from

schematic

Layout Window

ADS Layout Basics

Layers


15/342

1 - 3



5 December 2001


Options > Layers


5 December 2001


Layer Information

Everything is placed on a layer

There are 39 default layers

User may add new layers

User may define color and pattern associated with layers

Layers may be set to be visible/invisible

- items on invisible layers are hidden from view

Layers may be set to be selected/unselected

- items on unselected layers may not beselected / edited / moved / deleted


16/342

1 - 4



5 December 2001



Drawn shapes may be on any layer

- when drawing a shape it will be put on the current layer

- the current layer is listed in the center bottom of the window

and also in the entry list at the top of window

Use Insert > Entry Layer( or the entry layer list )

-to set the current layer


5 December 2001



Use Edit > Move > Move to Layer or double click on the shape

- to move a drawn shape to another layer


17/342

1 - 5



5 December 2001



Edit > Advanced Copy/Paste > Copy To Layer

-to create a copy of an object on another layer

ADS Layout Basics

Drawing Techniques


18/342

1 - 6



5 December 2001


Drawing Features

Insert menu to draw different shapes

- rectangle: , circle: , polygons: ,

polyline: , text:

- path: , trace: , wire, arrow,

construction line, dimension line, arc

Ensure snap preferences are set appropriately,

- options > preferences, grid/snap setting

Close Polygons automatically

- using space bar


5 December 2001


Drawing Features

Undo vertex if a mistake is made during drawing operation

- use RH mouse or Z

Insert > coordinate entry

- to define shape by vertex positions from keyboard

- enable more precise position and sizing of object


19/342

1 - 7



5 December 2001


Edit > Modify Commands

Convert shape to polygon

- circle becomes a polygonwith n vertices


5 December 2001



Circle Radius/Angle resolution

- this can be edited


20/342

1 - 8



5 December 2001



Modify arc resolution, and also layer:


5 December 2001



Force To Grid

- result in selected object being on grid

Join

- joins selected polylines into a single polygon


21/342

1 - 9



5 December 2001



Explode

- single polyline is converted into several polylines (segments)

- the polygon is converted into several polylines


5 December 2001



Break

- the starting/ending point of the polygon is broken to create asingle polyline


22/342

1 - 10



5 December 2001



Add

- vertices can be added to polyline/polygon/trace/path/wire

- they can be selected individually or in groups

- they can be moved


5 December 2001


Arc

corner


To Arc

- a vertex can be converted to an arc


23/342

1 - 11



5 December 2001


Arc

corner

Mitered corner


Miter

- a vertex can be converted to a mitered corner


5 December 2001


Absolute

co-ordinate

Relative co-ordinate

Layout unit

Measuring Objects

Dimensions can be measured:

Just look at co-ordinate reading at bottom of window

- left readout is absolute co-ordinate

- right readout is relative, and is reset when mouse is clicked


24/342

1 - 12



5 December 2001


Angle:

Relative to origin

Measuring Objects

Insert > Measure... or RH mouse menu > Measure...

- tells you cumulative distance and also angle

- reset after mouse double-clicked

ADS Layout Basics

Drawing Operations


25/342

1 - 13



5 December 2001


Selection Filters

Options > Preferences > Select settings

Make sure necessary layers are not protected(Options > Layers...)


5 December 2001


Editing Commands

Some preferences apply to things not yet placed

- Options/Preferences -Trace

- Placement

- Entry/Edit

- Units/Scale

Editing Menus for things already placed

Edit>Copy (c), Edit>Paste (v)

Edit>Advanced Copy/Paste menu,Copy Using Reference Point icon on toolbar:

Edit>Advanced Rotate/Mirror menu,Rotate icon on toolbars:

- rotation angle defined in Options>Preferences Entry/Editmenu


26/342

1 - 14



5 December 2001


Merging

Merging takes selected shapes and combines them into onepolygon

All shapes to be merged must be on the same layer

Merged items often simulate more efficiently in momentum

Merged items avoid problems during mask file generation

Select object to be merged - Edit > Merge


5 December 2001


Boolean Logic Polygons are placed on a destination layer

- the result of Boolean operation on objects on 2 source layers.

Check source and destination layers are not protected

Edit>Boolean Logical

- select source and destination layers

- select type of operation:

- DIFF, AND, OR, XOR.

- select shapes for comparison.

- select whether original shapes need to be deleted.


27/342

1 - 15



5 December 2001


AND OR DIFF XOR

Destination

layer

Sourcelayers

cond2

cond

Boolean Logic


5 December 2001


Scaling

Edit>Scale/Oversize>Scale

- specify scale factor for X and Y

- must be positive

- factor of 1.0, no change in size

- greater than 1.0, enlarges


28/342

1 - 16



5 December 2001


Oversizing

Edit>Scale/Oversize>Oversize

- Specify sizing amount

- positive number increase size of object

- also specify cutoff angle

- angles smaller than this will be mitered

Edit>Scale/Oversize>Copy And Oversize


5 December 2001



A ground plane is modified to ensure a certain gap between itand the selected shapes

Edit>Create Clearance

- select ground plane

- select shape

- enter desired clearance distance


29/342

1 - 17



5 December 2001


Edit>Create Clearance

Create ground plane

(e.g. rectangle)



5 December 2001


Positioning of objects

Objects ought to be on grid

Toggle Grid Snap Mode icon: to draw objects on grid

- set units before starting drawing

- changing units might result in objects being off-grid

Edit>Modify>Force To Grid

- objects when moved will snap onto the grid

Edit>Modify>Set Origin

- will reset origin to be at specified point


30/342

1 - 18



5 December 2001


Sub-circuitsub01


Edit > Component > Flatten

- removes all hierarchy on the top level design

- required for some drawing packages


5 December 2001


Sub-circuit

double_TEE


Edit > Component > Create Hierarchy

- select part of an existing layout

- command will create a subnetwork with defined name


31/342

1 - 19



5 December 2001


Name of

component

Layer

Information

about pins


Options > Identify (Also available in schematic)

- shows information related to selected item


5 December 2001



Options > Info

- Shows information on design

Options > Check Representation

- Check for wires in layout, overlaid components

mis-matches between layout and schematic etc.


32/342

1 - 20



5 December 2001


Design Rule Checker & custom DRC

Verify > DRC (Design Rule Checker)

- checks design rules, e.g. minimum width, spacing angle

- also custom DRC


5 December 2001


Definition Rule file

Job name

Name of Rule file

Custom DRC


33/342

1 - 21



5 December 2001


Load Result of

pwramp_drc

Use Summary to review the results

Custom DRC


5 December 2001


First error selectedError identified with a different color ( : turquoise)

Custom DRC


34/342

1 - 22



5 December 2001


Layer section

(extract)

Rule section

(extract)

Custom DRC: Rule File


5 December 2001


Layout Rules

Rules apply during direct entry of layout and also during designsynchronization:

- Elements should have physical representation (artwork)

- Stand alone element in schematic can be positioned asdesired in layout

- Positioning of connected elements is determined bypreviously placed connecting elements

- Elements cannot overlap physically

- Wires indicate a problem with positioning elements(do not use wires when you create your layout directly)


35/342

1 - 23



5 December 2001


Element Layers definition

Library elements are mapped to certain layers

- defined in MSUB element or similar

- may be changed in MSUB definition

Drawn shapes are drawn to current layer

- To set current layer:

- use Insert > Entry Layer

or the entry layer list at the top of window:

To move an object to another layer:

- use Edit > Move > Move To layer or doubleclick on the object.

ADS Layout Basics

Layout objects:



36/342

1 - 24



5 December 2001


Electrical/Physical Representation of

Elements

Electrical Physical

Component Yes Some (e.g. MLIN)

Wires Yes No (but can be used in

layout window)

Traces Yes (after synchronization Yes

to schematic)

Paths No Yes

Shapes No Yes


5 December 2001


Trace

Path

Wire



37/342

1 - 25



5 December 2001



Wire indicate an electrical short circuit

- starting and ending points must be component pins

- they have no physical dimensions

Paths are a special type of shape

- they have width, length and corner type

- they have no electrical model

Traces indicate an electrical short circuit

- starting and ending must be component pins

- they can converted to MLIN for example


5 December 2001


Trace

Path


Drawing Paths, Wires and Traces:

- will be drawn to current layer

- use Insert menu- or icons on toolbars:


38/342

1 - 26



5 December 2001


Trace and Path Attributes

Both traces and paths have physical attributes

- width, corner type, layer, and also lengths

Existing paths/traces can have attributes modified

- use Edit > Path/Trace > Edit Path/Trace

- or double click on the Path or Trace


5 December 2001



Have orthogonal entry mode on

- set in Options > Preferences > Entry/Edit tab

Use a coarser grid with snap-to-grid enabled

- use Options > Preferences > Grid/Snap

- or icons on toolbars:


39/342

1 - 27



5 December 2001



Improve positioning of corners

- draw with square corners, then edit path/trace corner type tobe mitered/curved as required


5 December 2001


Electrical/Physical Representation of

Elements

Electrical Physical

Component Yes Some (e.g. MLIN)

Wires Yes No (but can be used in

layout window)

Traces Yes (after synchronization Yes

to schematic)

Paths No Yes

Shapes No Yes


40/342

1 - 28



5 December 2001


Trace/Path/Wire Conversion

Paths can be converted to traces

- Edit > Path/Trace > Convert Path To Trace

Traces can be converted to paths

- Edit > Path/Trace > Convert Trace To Path

Traces can be converted to transmission line elements

- by using Edit > Path/Trace > Convert Traces... command

- also when you Generate/Update Schematic

Schematic > Generate/Update Schematic > Trace Control


5 December 2001


Transmission Lines

Split

- use Edit > Transmission Line > Split Transmission Line

- line will be split in 2 lines, at point where cursor is clicked


41/342

1 - 29



5 December 2001


Transmission Lines

Tap

- use Edit > Transmission Line > Tap Transmission Line

- line will be split in 2 TLs and a TEE at point where cursor isclicked


5 December 2001


Fixed

component

Transmission Lines

Stretch

- using Edit > Transmission Line > Stretch

- connected elements will be moved (if not fixed by Schematic> Fix Component Position)

- use Schematic > Show fixed Components to verify status


42/342

1 - 30


ADS Layout Basics

Schematic/Layout Preferences


5 December 2001


Options>Preferences


43/342

1 - 31



5 December 2001


Options > Preferences

Preferences which apply to things not yet placed:

- Trace

- Placement

- Entry/Edit

- Units/Scale

- Component Text

- Text


5 December 2001


Options > Preferences

Preferences which apply to things placed:

- Select

- Grid/Snap

- Pin/Tee

- Display

- Layout units


44/342

1 - 32



5 December 2001


Preferences Settings

Preferences for schematic and layout window are set separately

Preferences Setting are saved to file in project

layout.prf and schematic.prf

Preferences files from other projects may be read in

- Options > Preferences Read... button


5 December 2001


Preferences: Grid/Snap tab

The grid will help you to check dimensions


45/342

1 - 33



5 December 2001


Useful when you Generate/Update

Schematic

Choose yourRepresentation/Synchronization(Same preferences in Schematic

window)

Preferences: Trace and Placement tabs


5 December 2001


Possible to

intersect

edge

Adjacentangles

are

maintainedEnable/disable layer binding (used for port connection)

Used for drawing

polygon, trace ...

Preferences: Entry/Edit tab

These preferences will help you to design your circuit


46/342

1 - 34



5 December 2001


Choose your Layout units before

starting drawing!

Preferences: Unit & Layout Units tabs


5 December 2001


Preferences Pin/Tee

Will help you to check whether pins are connected or not, etc...


47/342

1 - 35


ADS Layout Basics

Design synchronization


5 December 2001



Each design created has 3 representations

- Schematic, used by circuit/system simulators

- Symbol, used to represent design when placed as asubnetwork in a top-level design

- Layout, physical properties of design

-used to generate mask file & for momentum simulation


48/342

1 - 36



5 December 2001


Symbol sub01 placed

as a sub-network

Schematic Layout



5 December 2001


Symbol Schematic Layout

Design Representation Condition

Not all representations need to be defined

Design may be created in either schematic or layoutrepresentation

Layout representation has certain rules

Design synchronization is possible- layout may be generated from schematic,

- or vice versa

Symbol is only generated from schematic


49/342

1 - 37



5 December 2001


Design Representation: Symbol

You can find two sorts of symbols:

Circuit symbols:

- $HPEESOF_DIR/circuit/symbols

Component Library symbols:

- $HPEESOF_DIR/ComponenLibs/symbols


5 December 2001


ADS Layout Window

Available default palette items...


50/342

1 - 38



5 December 2001


Entry/Edit Settings Options > Preferences > Placement

Single representation

- design can be input either into schematic, or into layout

Dual representation

- items placed in one representation are also placed in theother

- deleted/edited items are unchanged in the otherrepresentation

Always Design Synchronize

- items placed in one representation are also placed in theother.

At the same time any modified/replaced elements are updated


5 December 2001


Update Layout, Update Schematic

Schematic window

Layout > Generate/Update Layout

Layout window

Schematic > Generate/Update Schematic


51/342

1 - 39



5 December 2001


Synchronization Problems

Elements with no physical representation are depicted in thelayout by placeholder elements

Overlapping items

- are moved and connected by wire


5 December 2001


Synchronization Solutions

Options > Check Representation

Move components so that placeholder gap is correct size forcomponent without footprint/artwork

Manually place unplaced items

- using Layout > Place Component From Schematic To Layout


52/342

1 - 40


ADS Layout Basics

Variable Usage:

parameterized component, parametric sub-

network, hierarchy


5 December 2001


Design File contents

Each design created contains 3 sections

- schematic containing circuit model description andsimulation controls etc

- layout, containing circuit physical description

- symbol, containing custom drawn symbol

Some/all of the section may be empty

File has .dsn ending


53/342

1 - 41



5 December 2001


AEL File

In general, you can use AEL for these tasks:

- Organizing libraries and palettes of components.

- Defining the interface to new user-defined components.

- Creating new components with layout artwork.

- Defining custom layout artwork functions.

- Defining the interface to discrete-valued simulationcomponents.

- Creating custom utility functions, such as parts listgenerators and bill of materials.

- Automating routine tasks, such as repetitive commandsequences, batch analysis, or optimizations.


5 December 2001


AEL File

Ael Files contain information about

- simulator definition (set_simulator_type())

- component definition (create_item())

- current type of design for group definitions(set_design_type())

- Definition of new library group that is composed of the listedcomponents (library_group())

- definition of parameter (create_parm())


54/342

1 - 42



5 December 2001


Same window in bothschematic and layout

Design Definition


5 December 2001


Design Definition

Description

- The Description field displays the current design name bydefault.

Component Instance Name:

- The Component Instance Name default is X. The text in thisfield is used as a prefix in building a unique name (ID) forevery item.

Symbol Name:

- Points by default to a design (.dsn), file names starting withSYM_*.dsn

- Select symbol from drop down list or type in name of designfile containing artwork


55/342

1 - 43



5 December 2001


Design Definition

Library Name:

- In the Library Name field, specify the name of the library inwhich you want the sub-network stored.

Optional:

- Allow only one Instance

- Include in BOM:

- Layout object

- Simulate from Layout (Simlay)


5 December 2001


Design Definition

Simulation: select the appropriate Simulation method

Artwork: select the appropriate artwork Type


56/342

1 - 44



5 December 2001


Sub-networks

Each design created may be placed as sub-network in anotherdesign

- from library window book icon in toolbar

- or Insert > Component > Component Library


5 December 2001


Sub-networks

Every time placed has same performance: Fixed sub-network

Symbol is seen in top-level design

Push down command takes user into sub-network schematic orlayout definition


57/342

1 - 45



5 December 2001


File that definesthe variable

Name of the

variable

Options > Variables

Use this if you are specifying parameters with var_eqns such aslength and width for simulation.

If not specified with a path ( with Options > variable ), definitionof variable is looked for in top-level schematic.

Same window in both schematic and layout representation


5 December 2001


Main circuit:

filter

Sub-circuit:

sub02

Sub-circuit:sub03

Sub-circuit:

sub01

Options > Variables


58/342

1 - 46



5 December 2001


30 mil100 mil 100 mil

Sub01Sub02

Sub03

Sub-circuit:sub01

Main circuit:filter

Sub-circuit:sub02

Sub-circuit:sub03

Options > Variables


5 December 2001


Parametric sub-network

Define the variable asa Design Parameter...


59/342

1 - 47



5 December 2001


Parametric sub network

File > Design Parameters

Set definitions:

- Parameter Name (should not exceed 8 characters)

- Value Type: Choose from the drop-down list theappropriate type of your value:

e.g. real for the parameter M_MLIN

- Default Value: value automatically associated to theparameter when it is inserted

- Parameter Type: Choose from the list the appropriatetype of your parameter:e.g. Length for L_MLIN

- Parameter Description: Optional.Type a parameter description


5 December 2001



Advanced setting (optional)

- Display parameter on schematic:

select this option to display, on a schematic, the parameterbeing defined

- Optimizable:

Select this option to allow the parameter to be optimized

- Allow statistical distribution:

Select this option to allow a tolerance to be assigned tothis parameter during yield analysis


60/342

1 - 48



5 December 2001



Advanced setting (optional)

- Not edited:

Select this option to prevent this parameter fromappearing in the Component Parameter Dialog box forediting and always use the default value assigned hereinstead.

- Not Netlisted:Select this option to prevent a parameter from being

considered during simulation, but still recognized forgeneration of artwork


5 December 2001



Value of variable is chosen when component is inserted


61/342

1 - 49



5 December 2001



ADS Layout Basics

Creation and use of Fixed artwork


62/342

1 - 50



5 December 2001


No Artwork

Package TSFP_4:


5 December 2001


Artwork

Artwork Type None:

- No artwork, only aschematic andsymbol representation.

Layout Object

- Defines the design as alayout object.Layout objects have noparameters and are usedto create artworks.Layout objects are thenused by other designs astheir footprints


63/342

1 - 51



5 December 2001


Fixed Artwork

Creation of a transistor using TSFP_4 package as an Artwork


5 December 2001


Fixed Artwork

Artwork Type:

- Fixed if the layoutcontains noparameterizedelements.

- In the Name field:Select the name ofthe built-in shapes tobe associated with thissub-network


64/342

1 - 52



5 December 2001


Fixed Artwork

Bfp620f: Fixed Artwork associated with TSFP_4


5 December 2001


$HPEESOF_DIR/custom/ComponentLibs/packages

$HPEESOF_DIR/custom/ComponentLibs/packages

$HPEESOF_DIR/custom/config/de_sim.cfg

Create directory

Copy "packages".dsninto this directory

Create and/or set

SYSTEM_COMPONENTLIBS_PACKAGES

DIRECTORY / FILE ACTION

Custom Fixed Artwork packagesMake it available for CUSTOM, site customization

Custom fixed artwork packages are only available in the projectdirectory where you create them

Otherwise, you have to modify the search path of a particularvariable in a configuration file.


65/342


66/342

1 - 54



5 December 2001


$HPEESOF_DIR/circuit/ael/geminidsndef.ael

$HPEESOF_DIR/custom/circuit/ael/geminidsndef.ael



Copy to

$HPEESOF_DIR/custom/circuit/ael

Edit File

Create and/or set SITE_AEL


1. Be sure to have completed previous step 1. to 4.

2. Go to $HPEESOF_DIR/circuit/ael


5 December 2001



3. Copy the file geminidsndef.ael into$HPEESOF_DIR/custom/circuit/aelCreate these folders if they dont exist

Open the file with a text editor and go to the header


67/342

1 - 55



5 December 2001



4. Add (or delete) the wanted (or unwanted) fixed artworkpackages available in$HPEESOF_DIR/circuit/ComponentLibs/packages to the list.

E.g. Adding fixed artwork packages: MySOT23 and MySOT323

The number defines the place in the drop down list


5 December 2001



5. Go to $HPEESOF_DIR/custom/config

6. Edit or create the file de_sim.cfg and set the variable

SITE_AEL={$HPEESOF_DIR}/custom/circuit/ael

7. Restart ADS, the new fixed artwork should be available in thedrop down list site wide.


68/342

1 - 56



5 December 2001



The default path to place your custom fixed artwork packagesfor HOME, user customization is$HOME/hpeesof/ComponentLibs/packages.This path is already set in the configuration file$HPEESOF_DIR/config/de_sim.cfg by the variable:

HOME_COMPONENTLIBS_PACKAGES={$HOME}\hpeesof\{%PROJECT4}\packages

with

PROJECT4 = ComponentLibs


5 December 2001



So it's not necessary to redefine this variable in$HOME/hpeesof/config/de_sim.cfg unless you want to place thepackages in an other directory than the default one:$HOME/hpeesof/ComponentLibs/packages

Procedure to place fixed artwork packages in a differentdirectory: e.g.:$HOME/hpeesof/ComponentLibs/SMTpackages


69/342

1 - 57



5 December 2001


$HPEESOF_DIR/circuit/ael/geminidsndef.ael

$HPEESOF_DIR/custom/circuit/ael/geminidsndef.ael



Copy to

$HPEESOF_DIR/custom/circuit/ael

Edit File

Create and/or set SITE_AEL


1. Create a directory $HOME/ComponentLibs/SMTpackages

2. Copy the fixed artwork package design files *.dsn in to thisdirecotry.Keep in mind to have unique symbols names, to avoid conflictwith the ADS build in fixed artwork package designs


5 December 2001



3. Go to $HOME/hpeesof/config

4. Edit or create the file de_sim.cfg and set the variableHOME_COMPONENTLIBS_PACKAGES={$HOME}/hpeesof/ComponentLibs/packages:

{$HOME}/hpeesof/ComponentLibs/SMTpackages

The fixed artwork package files saved in$HOME/hpeesof/Componentlibs/packagesand $HOME/hpeesof/Componentlibs/SMTpackages are availablefor the user by typing in the correct name in the Fixed ArtworkName field of the Design/Parameters of the design.


70/342


71/342

1 - 59



5 December 2001


Custom Fixed Artwork packagesAdd it to the drop down list, with HOME, user customization

The number defines the place in the drop down list.

5. Go to $HOME/hpeesof/config

6. Edit or create the file de_sim.cfg and set the variable

USER_AEL={$HOME}/hpeesof/circuit/ael 7. Restart ADS, the new fixed artwork should be available in the

drop down list for the user.

ADS Layout Basics

Built-in AEL artwork macros


72/342

1 - 60



5 December 2001


AEL macro artwork

Use the built-in AEL macro's as artwork for a schematic

Needed when the package and/or the foot print dimensions arenot fixed

The AEL macro's can be assigned to a schematic design usingthe File > Design Parameters... dialogue box.


5 December 2001


List of AEL macros The list starts with ael macro's used by ADS built-in components

like macro's used by e.g.: MLIN and MCURVE.

Followed by a collection of:

Ceramic Flat Pack (CFP) packages: (smtart_CFP24 CFP40-20)

Chip and MELF packages: (smtart_0402 smtart_SOD87)

SOT, DPAK, D2PAK packages: (smtart_23 smtart_D2PAKPlastick Flat Pack (PFP) packages: (smtart_PFP16 smtart_PFP20)

Quad Flat Pack (QFP) packages: (smtart_QFP32A smtart_QFP94)

Plastick Leaded Chip Carrier (PLCC):(smtart_PLCC18AAPLCC44SQ)

Small Outline IC (SOIC): (smtart_SO8N smtart_32L).


73/342

1 - 61



5 December 2001


Pad Width

Pad Layer

Solder Mask Layer

Pad Offset from

Connection Pin

Solder Mask Overlap

Pad Length

L

W

SMO

SMT_Pad component

AEL macro's starting with smtart_use a SMT_Pad component (Lumped with Artwork palette) inthe schematic to define the pad properties.


5 December 2001



Create your design in the schematic window


74/342

1 - 62



5 December 2001



Define your designparameters:

- File > DesignParameters

Choose AEL Macro forArtwork Type

Choose from the drop-down list the macro youwant to associate withyour schematic design


5 December 2001



Define Parameter(s)

if the schematicor the AEL artworkneeds them.


75/342

1 - 63



5 December 2001



BFG33_5V_15mA: AEL Macro associated with smtart_sot143A

ADS Layout Basics

Graphical Cell Compiler (GCC)


76/342

1 - 64



5 December 2001


GCC: Introduction

Purpose:

- adding parameterized artwork Macros (PAM)

Advantages:

- simpler than coding in AEL

- getting started very quickly

- create a special model quickly, without the need to know AEL


5 December 2001


GCC: How to build a PAM

1) Define the artwork graphically in a Layout window

2) Define parameters to control the artwork dimensions

3) Compile the macro

4) Set the parameter default values and save the macro

5) Insert the new component (macro) in a layout

6) Edit the parameters for each instance of the new component


77/342

1 - 65



5 December 2001



Define the artwork graphically in a Layout window

- the first step is to design your artwork macro

This artwork will be used as an element and will be able to be

- stretched in length

- stretched in width

- rotated

- repeated


5 December 2001



Define parameters to effect the artwork

- Macro > Stretch Macro > Rotate/MirrorMacro > Repeat... Macro > PolarMacro > Width Macro > User-Defined...

- before defining parameters, draw construction lines

- use the Macro toolbar to define parameters


78/342

1 - 66



5 December 2001




5 December 2001



Compile the macro

- Macro>Compile

- the macro will be saved as_art.ael

- the model name is the nameused to select the artworkfrom the libary


79/342

1 - 67



5 December 2001



Set the parameter default values and save the macro:Macro > CompileFile > Design/Parameters

- In the General tab :

- define the characteristicsof the sub-network


5 December 2001



In the Parameter tab :

- set the default values

- default values are used

when the PAM is placed


80/342

1 - 68



5 December 2001


GCC: How to build a PAM, Step 5&6

Insert the new component (macro) in a layout

Edit the parameters for that instance of the new component

- parameters can be edited when the PAM is inserted or later

ADS Layout Basics

Using Momentum Simulator


81/342

1 - 69



5 December 2001


What is Momentum?

Momentum is a planar electromagnetic (EM) simulator:

- Enables RF and microwave modes

Real-world coupling and parasitic effects are taken into account

Momentum:

- Analyze multi-layer arbitrary shapes

- Compute S-, Y- and Z-parameters

- Generate EM models that are used directly in ADS

- Overcomes the limitations of circuit simulators


5 December 2001



Momentum RF Mode:

- designed to increase simulation speed and reduce computermemory requirements

- especially well adapted to structures under a half wavelength

Momentum (microwave) and Momentum RF modes use differentMethod of Moments technologies

- to produce S-, Y- and Z-parameter models for layout-based,physical designs


82/342

1 - 70



5 December 2001



Both modes generate a mesh in preparation for simulation ofthe circuit

However, Momentum RF uses a mesh-reduction technology toeliminates low-quality slivery cells and electromagneticallyredundant interactions

Momentum RF uses star-loop technology to

- eliminate low-frequency breakdown of numerical solutions- give stable solutions down to DC


5 December 2001




83/342

1 - 71



5 December 2001


Major Benefits of Momentum

Momentum enables you to:

- Simulate when a circuit model range is exceeded or themodel does not exist

- Identify parasitic coupling between components

- Go beyond simple analysis and verification to designautomation of circuit performance

- Visualize current flow

- 3-dimensional displays of far-field radiation (not MomentumRF)


5 December 2001


Major Features of Momentum

Key features of Momentum include:

- An 2.5D electromagnetic simulator based on the Method ofMoments

- Adaptive frequency sampling for fast, accurate, simulation

results

- Optimization tools that alter geometric dimensions of adesign to achieve performance specifications

- Comprehensive data display tools for viewing results

- Equation and expression capability for performingcalculations on simulated data


84/342

1 - 72



5 December 2001


Momentum Process 1) Create a physical design

2) Choose Momentum or Momentum RF mode


4) Solve the substrate (optional)


6) Add a box or a waveguide (optional)




5 December 2001


Layout representation

Physical design created in schematic

window: mom_filter

1) Create a physical design


85/342

1 - 73



5 December 2001


Momentum Momentum RF

Click here to

switch themode

2) Momentum or Momentum RF mode


5 December 2001


Properties of the

selected layer

Set substrate

Layers here



86/342

1 - 74



5 December 2001


Set Metallizationlayers here



5 December 2001


4) Solve the substrate (Optional)

Optional because the substratewill be computed during thesimulation if not previouslycomputed

Choose the frequency range for aMomentum simulation

Not Needed for a Momentum RFsimulation


87/342

1 - 75



5 December 2001



5 types of ports:

- Single

- Internal

- Differential

- Common mode

- Ground reference


5 December 2001



Set the value of the mesh frequency to thehighest frequency that will be simulated

The Number of Cells per Wavelengthwill be used to determine the density

of the mesh Any curved areas in the circuit will be

meshed using facets.In the Arc Facet Angle field, enter thenumber of degrees that will beincluded in a single facet


88/342

1 - 76



5 December 2001



Enable Edge Mesh to add a relativelydense mesh along the object edges

Enable Transmission Line Mesh tospecify the number of cells acrossthe width of a geometry.It is most useful for circuits withstraight-line geometry.

Enable Thin layer overlap extractionin order to extract objects in the

following situation:

- Two objects on different layers overlap- The objects are separated by a thin substrate layer


5 December 2001


Notice the mesh

generated


Enter the frequency you want to use forpre-computation of the mesh

The wavelength of this frequency will, in part,determine the number of cells in the mesh


89/342

1 - 77



5 December 2001


1. Select the

Sweep Type

and the

frequency

range

2. Click on

Add to

FrequencyPlan List

3. Click on

apply then on

Simulate


Choose Range and Type of Frequency Plans


5 December 2001


Notice the name:

Momentum_mom_filter

_a in mom_filter_a

means the results are

taken from the adaptivesimulation

9) View the results


90/342

1 - 78



5 December 2001


9) View the results

Another possibility is to view the resultsusing the Post-Processing menu


5 December 2001


9) View the results


91/342

1 - 79



5 December 2001


1. Click on

Start The

Instrument

Server

button

2. Choose

Write

3. Choose

Write To File

5. Write a

name and add

a .s2p

extension toindicate a

2 Port, S-Parameter file

6. Choose the

simulationresults

4. Choose

Touchstone

for the File

Format

Data conversion to .sNp file


5 December 2001


S2P component using S-Parameters from the s2p

file

Simulation results similar

to the Momentum

simulation

NOTE. It is possible to usethe dataset directly

Using the .sNp file


92/342

1 - 80



5 December 2001


Momentum Optimization

3 steps are needed to optimize some parameters:

- Define the parameter(s) to be optimized

- Define the Goal(s)

- Set up the optimization

- Run the optimization

Then you can see the summary


5 December 2001



1. Create the design

First, design a filter with paths that have these dimensions

- Length: 200 mils

- Width: 25 mils

- Space between lines: 5 mils


93/342

1 - 81



5 December 2001


4. A new design is

opened automatically.

Reduce the width of all

lines to 5 mils to havethe perturbed value

3. Click onAdd and see

the newparameter

definition

2. Select

Allowed to

vary

5. Click OK to close

the width definition

1. Fill theParameter

Definition

field

Mom Optimization,

2. Define parameter

Momentum>Optimize>Parameter

Parameter defined: width


5 December 2001


9.5 10 10.5 F (GHz)

S21 (dB)

-20

-3


3. Define the goals

Momentum>Optimize>Goals...

The goals are defined for a 10GHz bandpass filter

3 goals are defined

- 2 for the stop-bands

- 1 for the pass-band


94/342

1 - 82



5 December 2001



4. Run the simulation

Momentum>Optimize>Run

Optimization Type: Minimax

Interpolation Type: Linear Interpolation

Maximum number of iteration: 10

Stop as soon as the specs are metselected

Click Apply then Start


5 December 2001




After the simulation is finished, reopen the optimizationParameter box to visualize the Optimal value:

- in this case, this is 12.87 mils


95/342

1 - 83



5 December 2001


S21

Goals



From the Momentum Optimization window, chooseDisplay>Rectangular (Default setting display S21 and Goals)


5 December 2001




Momentum>Optimize>Summary

Notice the Error doesnt decrease very much in the lastiterations, so the filter cannot be improved significantly with thisgeometry


96/342

1 - 84



5 December 2001




For more accurate results, simulate the optimized circuit fromthe second layout window, which is created automatically.

- Add an adaptivefrequency sweepfrom 8 to 13 GHzand simulate


5 December 2001



6. Improving the filter

For an improved design, you can:

- Increase the number of iterations

- Redefine the Goals with more accuracy

- Add more Goals

- Attribute some value to the weight of Goals

- Increase the number of points

- Change the geometry of the filter

- Add more parameters to be optimized


97/342

1 - 85



5 December 2001



The layout consists:

- coplanar waveguide slots

- bridges that span the two slots

- via tha directly connect the bridges to the slots


5 December 2001




98/342

1 - 86



5 December 2001



Momentum>Substrate>Create/Modify...

In metalization Layers, use Strip, Slot and via buttons to createbridge, via and slot.

ADS Layout Basics

Import and Export Files


99/342

1 - 87



5 December 2001


Layout Export consideration

Consider how the final output could affect the layout process.

Different output formats impose different restrictions.

Consider layout units and data base precision.

Usually no problems are associated with translating unitsHowever, round-off errors can occur when translating frommetric-to-English units or vice versa.

No problem is associated with translating a less precise data

base resolution in the program to a more precise outputresolution. However, the reverse process (such as, 0.001 Layoutto 0.01 GDSII) can result in loss of data.


5 December 2001


3 more

important

formats

Available File Formats

Available Formats and Import/Export Options


100/342

1 - 88



5 December 2001


Importing a Layout

In Advanced Design System, you can import files in theseformats:

- DXF (hierarchical)

- EGS Archive Format

- EGS Generate Format

- GDSII Stream Format

- HPGL/2

- IFF- IGES

- Mask File (.msk)


5 December 2001


Importing a Layout

1. In the layout window,

choose File > Import to open

the Import dialog box.

2. Select the file

type you want to

import

3. Click More

Options to

invoke this

window

4. Click Browse

or enter the full

path of the

source file

You can also define the layers

5. Click Browse or enter the

full path of the Layer file

6. Click OK to

start the import

process


101/342

1 - 89



5 December 2001


Exporting a layout

- DXF

- EGS Archive Format

- EGS Generate Format

- GDSII Stream Format

- Gerber

- HPGL/2

- IFF

- IGES

- Mask File (.msk)

- MGC/PCB

In Advanced Design System, you can export files in theseformats:


5 December 2001


Exporting a Layout

Before exporting your design, it is better to do:

- Generate the artwork:- File>Generate Artwork

- Merge all shapes that are on the same layer- Select all shapes

- Edit>Merge

You can now start the export process


102/342

1 - 90



5 December 2001


Exporting a layout

1. In the layout window,

choose File > Export to open

the Export dialog box.

You can also define the layers

2. Select the file

type you want to

export 3. Click More

Options to

invoke this

window

4. Click Browse or enter

the full path of the

destination file

5. Click OK to

start the export

process

ADS Layout Basics

Import and Export Files:



103/342

1 - 91



5 December 2001



The Drawing Exchange Format (DXF)

- was developed by Autodesk for its AutoCAD product

- is widely used to transfer geometric data between systems.

- provides a simple geometric representation of data.

DXF files can be transferred between PC-based or UNIX-basedsystems.

ADS supports import from and export to AutoCAD versions 12,14, and 2000.


5 December 2001



ADS provides two different DXF translators

- a hierarchical translator and

- a flattened translator.

The DXF hierarchical translator is a bidirectional translator thatsupports both full hierarchy and all layer separation.

The DXF flattened translator supports only export.


104/342

1 - 92



5 December 2001


Importing DXF (hierarchical) files

egs archive format is needed to import to and export from DXFformat

DXF (hierarchical) Block Diagram : Importing and Exporting


5 December 2001



Unit Conversion:

- The AutoCAD Units (DXF file)and ADS Units (EGS Archive file)drop-down menu selectionsdisplay the available units

The Auto Scale attribute is used to automatically scale eachlength in the DXF file to the specified ADS units.

The Link Zero-Width Elements attribute is used to mergeadjacent line segments into polygons. (Useful when sendingdata to Momentum, because Momentum can only mesh andsimulate bounded elements.)


105/342

1 - 93



5 December 2001



The Arc Extrapolation sectionenables you to optimize arcs for aparticular application.

- The Arc Resolution defines thearc segment in degrees. Thelower the value of the ArcResolution, the smoother thearc.

- The Arc Sag helps to compensate for the triangle flat caused

by each of the arc segments.By working with the dimension between the flat and the peakof the arc, the arc becomes gradually smoother. The units forArc Sag distance are defined in the Unit Conversion section.


5 December 2001



When importing large DXF files, youcan save valuable computation timeby including only specific layers.

The following fields enable you to

select particular layers that you wantto include in your import.

Click on Search for Layers to view the layers


106/342

1 - 94



5 December 2001


Importing DXF (hierarchical): Mapping

DXF to ADS

Mapping of DXF File Shapes to ADS File Shapes


5 December 2001



All Filled transfers all data as filled.

Auto Merge: all shapes forevery mask layer that intersect or overlapare merged.

Flatten All, removes automatically all levels

of hierarchy and exports a single flat design

Flatten Components: all parameterized components areflattened.

Generate R14 Output, generates an AutoCAD version R14database


107/342

1 - 95



5 December 2001



Paths As Polygons: the design paths ortraces are exported as polygons. This shouldbe selected for the following conditions:

- Paths or traces have mitered or curvedcorners that need to be preserved in thetranslation.

- The EGS Archive file has paths with endpoint types otherthan embed that need to be preserved in the programdatabase.


5 December 2001



Holes As Polygons selected, holesare converted into polygons.

Holes As Polygons not selected,polygons with holes are translated as single-segment polygons, the false edge segment

becoming part of the polygon. Some systems may not be able to tolerate this type of complex

polygon. For these systems, make certain that Holes AsPolygons is selected.

Holes As Cutlines selected, holes are converted into cutlines.


108/342

1 - 96



5 December 2001


Exporting DXF (hierarchical): Mapping

ADS to DXF

Hierarchical DXF Output


5 December 2001


Exporting DXF (flattened) Files

When exporting files using the DXF (flattened) translator, theprogram first creates an intermediate mask file. This file is thentranslated into DXF format as shown below:


109/342

1 - 97



5 December 2001



1. In the layout window, choose File > Export to open

the Export dialog box. And choose DXF (flatened)

2. Click on More Option to

set them as you want

3. Click OK to

dismiss this

window

4. Clik OK to start the

export process


5 December 2001



5.Select the Mask file and

the DXF file you want to

export

6. Choose between Polylineand Line

7. Set thescale factor

8. To invoke the Gerber

Viewer and view the mask

file, click View Mask

9. Click Translate to

export the DXF file


110/342

1 - 98



5 December 2001



These are the units that the DXFfile will be written in. You mayselect from the following options:same, mil, inch, um, mm, cm.

Scale X, Scale Y

- The DXF output can be multiplied by a scale factor.

Define Layers

- Clicking this button invokes the Layer Editor.

- Layers Include and Layers Exclude buttons enable you tospecify layers to either include or exclude.


5 December 2001



Auto Merge: all shapes for everymask layer that intersect oroverlap are merged.

Arcs As Polygons exports arcs asline segments (polygons).

Hole Formatsection enablesyou to define how the translator deals with holes in a design.

- Holes As Polygons - Holes As Cutlines

- Holes As Polygons not selected, polygons with holes aretranslated as single-segment polygons, the false edgesegment becoming part of the polygon.


111/342

1 - 99



5 December 2001



The etch factor applies a globalover/under size amount to eachshape translated. This is meant tocompensate for etch effect duringprocessing.We recommend that you retainthe default setting of 0.

Miter Angle is the angle cutoff used with the etch factor. The

miter angle controls acute angle edge over-extension. Any anglebelow the miter angle amount is mitered. The default value is90.0.


5 December 2001


Exporting DXF (flattened): Mapping ADS

to DXF

Hierarchical DXF Output


112/342

1 - 100



5 December 2001



Importing as DXF

Polygon with a hole

Hole format:

Holes as Cutlines

Exporting as DXF

DXF

viewer


5 December 2001


Example of DXF formatHole format:

Holes as Polygon

Importing as DXF

Polygon with a hole

Exporting as DXF


113/342

1 - 101



5 December 2001


Example of DXF formatPath as Polygon

unselected

Importing as DXF

Path

Exporting as DXF


5 December 2001


Example of DXF formatPath as Polygon

selected

Importing as DXF

Path

Exporting as DXF


114/342

1 - 102



5 December 2001



Importing as DXF

Circle

Exporting as DXF


5 December 2001



Importing as DXF

Rectangle

Exporting as DXF


115/342

1 - 103



5 December 2001



Importing as DXF

Polygon

Exporting as DXF


5 December 2001



Importing as DXF

Polyline

Exporting as DXF


116/342

1 - 104



5 December 2001



Importing as DXF

Text

Exporting as DXF


5 December 2001



Trace with ports

Exporting as DXF


117/342


118/342

1 - 106


ADS Layout Basics

Import and Export Files:

GDSII Stream File


5 December 2001


GDSII Stream File

The GDSII Stream File Translator is a bi-directional graphics filetranslator.

- It can create files in GDSII Stream file format from ADSlayouts

- it can translate graphics files from GDSII Stream file formatinto ADS layouts.

GDSII has some limitations that may affect your layout,including:

- No support for arcs or circles

- Limit of 200 vertices per shape - No support for holes orempty regions

- 32 character name limitation

- Limit of 255 mask layers


119/342

1 - 107



5 December 2001


GDSII Stream File: Mapping table

Mapping table for GDSII elements and their ADS layoutequivalents.


5 December 2001



Guidelines and considerations

When transferring a GDSII file via FTP, you must specify thebinary option.

When transferring a file via tape, the 2048 block size must bepreserved. To write fixed-block sized tapes for transfer to othersystems, refer to your computer system documentation.


120/342

1 - 108



5 December 2001




Reading a GDSII file may also fail if the file is the wrong versionor has been corrupted. Because the GDSII stream is a block-structured binary file, it can easily be corrupted whentransferring the file from one system to another.

Filenames Versus Instance Names:

- When importing a GDSII file into the Advanced Design

System, the design name on the Layout title bar may differfrom the GDSII filename. Otherwise, you have to close thedesign that will be overwritten by the imported one.


5 December 2001



1. In the layout window, choose File > Import to open the

Import dialog box. And choose GDSII Stream Format

2. Click on More Option to

set them as you want

3. Click OK to

dismiss this

window

5. Click OK to start

the import process

4. Choose the

Import File

Name and the

Layer file Name


121/342

1 - 109



5 December 2001



Selecting Data Type Property enables importof GDSII files that use the Data Type record inGDSII and retain the information in a propertyattached to the corresponding ADS data structure.

The data type for all objects is set to 0.

Exported, then Imported with

Data Type Property

selectedCircle


5 December 2001



When enabled, any Data Type records encountered on Boundaryor Path structures while importing a GDSII file cause a propertynamed Data Type to be created and attached to the resultingdata group in the Advanced Design System. The value of theproperty is set to the integer value found in the GDSII record.

In the reverse manner, Data Type records are created in theGDSII file when enabled for data groups that have a Data Typeproperty with integer value.


122/342

1 - 110



5 December 2001



Selecting Plex Property enables import ofGDSII files that use the PLEX record inGDSII and retain the information in aproperty attached to the correspondingADS data structure.

When enabled, any PLEX records encountered on Boundary,Path, SREF, AREF, and TEXT structures while importing a GDSIIfile cause a property named PLEX to be created and attached tothe resulting structure in the ADS. The value of the property isset to the integer value found in the GDSII record.

In the reverse manner, PLEX records are created in the GDSII filewhen enabled for structures that have a PLEX property withinteger value.


5 December 2001


Exporting GDSII :


You can create a bidirectional GDSII file from the current designfile. Translated GDSII files appear in layout representation only.Although no electrical connectivity information is included,hierarchy and mask layer information is preserved.

ADS writes the layout representation of a hierarchical design

into GDSII stream format using the current layout units andprecision.

The GDSII file created is of fixed-block size (2048 bytes), and is aproper subset of the stream format.

Valid GDSII layer numbers are from 0 to 255. The data type for allobjects is set to 0.


123/342

1 - 111



5 December 2001


Exporting GDSII:


Note that only some object attributes are translated:

- When paths are converted, the endpoint type is ignored andthe type 0 is applied (square-ended at digitized point).

- Holes in the program are translated as filled polygons, or as asingle polygon with the hole joined to other polygons by anew edge.

- Circles are converted to polygons and arcs are converted toseveral polylines.


5 December 2001


Exporting GDSII:


Note that only some object attributes are translated:

- Text is translated with a bottom left justification. A scalefactor showing magnification of the text height over one userunit and an optional rotation angle are also translated.

- Data groups with more than 200 vertices are not translated

(GDSII 200 vertex limit).


124/342

1 - 112



5 December 2001


Exporting GDSII:


When you attempt to translate shapes with more than 200vertices, a warning message is printed

ads layout manual

Documents