orcad signal explorer - flow cad · flowcad d.de d.ch a signal driver sends a signal to a receiver...

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OrCAD Signal Explorer

FlowCAD

Introduction to SI

• What is SI?

• Who needs to be concerned with Signal

Integrity?

• Why are they becoming such an issue?

• What solutions does Cadence provide for SI

Simulations?

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A Signal

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A Signal

Driver sends a signal to a receiver

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A Signal

Driver sends a signal to a receiver which must arrive within known

thresholds

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while the signal integrity engineers clear the path.

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In one sentence… What are we trying to do?

0011001101100 0011001101100

0011001101100 ?01?00?10?1??

(not exactly sure)

0011001101100 Is it sending

something?

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SI Issus

• Reflection

• Crosstalk

• Distortion

• Ground Bounce

• …

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When is a design „high-speed“?

• High-speed is not the same as high clock

frequency!

• What matter is device rise/fall Time and track

length

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When is a design „high-speed“?

• «Long» transmission lines creates reflexions on

short rise/fall time

• Electrical long transmission lines:

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Why are they becoming such an issue?

• More and more high-speed signals on a board

• Miniaturisation

• Designs are becoming more complex (more

than one technology on a board)

Consequence:

• Controlled Impedance, Termination, Topology,

and Timing

• Use SI Tools to analyse your nets

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Cadence SI Simulation Tool

OrCAD SigXP

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Cadence SI Simulation Tool

OrCAD SigXP

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How do we know what the signal will look like

when it reaches the receiver?

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Driver Model

Receiver Model

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Driver Model

Receiver Model

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Simple test….

Simulate

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Simple test….

Simulate

Expected Results

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Simple test….

Simulate

Expected Results What happened???

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Mismatches in Engineering Generally cause

problems…

Civil Engineers get it, you wouldn’t see these connected

Mechanical Engineers get it, these connections don’t exist

either

But Electrical Engineers do it all the time

15 ohms

75 ohms

1000 ohms

1000 ft

1000 mm

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What happens when a signal hits a mismatch?

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What happens when a signal hits a mismatch?

A BOUNCE DIAGRAM is

used to mathematically

calculate:

The magnitude of the

incident wave

The magnitude of the

reflected wave

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Impedance mismatch cause reflections

Solution: Impedance Matching

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Terimination Options

• Serial Termination → Demo

• Pulldowm Termination

• Pullup Termination

• RC Termination

• Thevenin Termination

• «Dioden» Termination

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Crosstalk

• In electronics, the term crosstalk (XT) has the following meanings:

• Undesired capacitive, inductive, or conductive coupling from one circuit, part of a circuit, or channel, to another.

• Any phenomenon by which a signal transmitted on one circuit or channel of a transmission system creates an undesired effect in another circuit or channel.

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Mutual Inductance and Capacitance

• Crosstalk is the coupling of energy from one line

to another via:

– Mutual capacitance (electric field)

– Mutual inductance (magnetic field)

Mutual Capacitance, Cm Mutual Inductance, Lm

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Process with SI Simulation

• Pre-Route simulation

• Post-Route simulations

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• What‘s necessary:

– correct Xsection definition

– define DC net‘s

– assign Model‘s

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• Pre-Route Simulation:

– define constraint Rules

– define determination strategy

– create „clock Floorplaning“

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• Post-Route Simulation:

– timing verification

– signal verification

– Bus analysis

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Design Link: single DDR3 data line

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Design Link: a single DDR3 data line

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Bus Analysis

- Bus Analysis

- Sweep component values

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Define Design Constraints in the SigXP and

transfer them to PCB Editor

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Allegro PCB SI

• Allegro PCB SI XL

– Simulation

• Allegro PCB PDN Analysis

– New 3D-Fieldsolver for Power Integrity simulation

• Allegro PCB SI Multi Gigabit Option

– Channel Analysis, Bathtub-Curve

• Allegro SI GXL

– includes all

Allegro PCB SI XL A

Allegro PCB SI GXL

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h What‘s New in Signal Integrity

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SI Application Mode

• Integration via context

– Efficient Access to SI-

Functions

Highlight on hover

Context

sensitive

RMB menus

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SI Application Mode

• Double-Click starts

– Signal Probe

– Model Assignment

– Show Element

Element Drag Shift-Drag Ctrl-Drag Double-Click

Net move move copy signal probe

Symbol move spin copy model assignment

Pin add connect

DRC Error show element

Cline Segs slide delay tune

Ratsnest add connect

Via slide move copy

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Allegro PCB Power Delivery Network Analysis

• Analyse of power supply

• Detects current and

temperature hot spots – Layers strucutre can be optimized

– Optimized selection of capacitors

– Detection Resonant frequencies

• Cadence 3D full wave Simulator

• For Power- and Ground Nets

• Analysis: – PI Planes

– PI Network

– IR Drop

• Flexible Use Model

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• Showing current flowing direction with arrows

• Canvas selection reveals current value in Options pane

IR Drop Current Path Display

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• Easy to find “hot spots”

• Current direction shown as well

IR Drop Current Density Display

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Besten Dank für Ihre Teilnahme und für Ihr

Interesse!

Für Fragen, Anregungen oder

Bemerkungen erreichen Sie mich unter:

Tel.: + 41 (0) 56 485 91 91

E-Mail: support@flowcad.ch

FlowCAD

orcad signal explorer - flow cad · flowcad d.de d.ch a signal driver sends a signal to a receiver...

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