ee4111 advanced analog electronics design -...

EE4111Advanced Analog Electronics Design

Spring 2009

Experiment #4

April 6 ~ April 17

http://www.ece.umn.edu/�

Setup Cadence in VLSI Lab

1) Copy files$ cp –r /home/grads/ee4111ta ~/

2) Edit your .cshrc file-- Include the following line in your ~/.cshrc file:

source ~/ee4111ta/.cshrc_ncsu

-- save & close your .cshrc file

-- $ source ~/.cshrc

3) Check files$ cd ee4111ta

$ ls –la (should have .cdsinit, .cdsplotinit, cds.lib files and models directory in your ee4111ta directory)

2EE 4111 Experiment #4

Setup Cadence in VLSI Lab

4) Invoke cadence in your ee4111ta directory$ icfb


Create a library for a new design1) In “V irtuoso Window”

File -> New -> Library2) In “New Library Window”

Name: OPMTechnology File : Attach to an existing technology library

3) In “Attach Library Window”Technology Library:NCSU_TechLib_tsmc03d

4) OK


1

22

3

4

Create a schematic for a new design1) In “Library Manager Window”

File -> New -> Cell View

2) In “New File Window”Libray: OPMCell: DIFF

3) OK


2

3

1

Design A Differential Amplifier


Placing components1) Add Instance

2) Add Wire

3) Add Pin

1 2 3


1) Browse

2) NCSU_Analog_Parts

3) N_Transistors

4) nmos4

5) Width: 60u

6) Length: 1.2u

7) Click the right button of the mouse in “Virtuoso Schematic Editor Window”

Add A MOS Instance1

2

3

5

6

4


Add Components (1/3)

Group Name components

P_Transistors pmos4

N_Transistors nmos4

R_L_C res, cap, …

Supply_Nets vdd, gnd

Voltage_Sources vdc,vsin, …

Current_Sources idc, …

• All basic components are in the library, “NCSU_Analog_Parts”• There are several groups as shown below:



• Implement a schematic using the following parameters– Resistance: 4KOhm

– NMOS: W=60um, L=1.2um

– Input voltage: DC = 770mV, AC = 1V, phase = 0/180

– Supply voltage: DC = 3.3V

• Use “wire” to connect all components


Add Pins

Pin Names Direction

INN input

INP input

OUTN output

OUTP output

1

3

2

4

4) Save & Check ErrorIf there is no error or warning, you implement the schematic successfully.


Useful Commands & Keyboard Shortcuts

• Edit

– Delete

– Rotate

– Move

– Stretch

– Properties -> Objects

• ESC – Cancel command

Add component: iAdd wire label: lAdd wire: wAdd pin: pCopy: cCheck and Save: XDelete: DeleteEdit properties: qFit: fHierarchy->Descend: EHierarchy->Return: ^eMove: MRedraw: F6Redo: URotate: rStretch: mUndo: uZoom in: zZoom in by 2: [Zoom out by 2: ]


Cadence Analog Design Environment

1) Launch -> ADE L

2) Virtuoso Analog Design Environment Window pop up

3) Setup -> Design

4) Simulator : spectre

5) OK


3

1

4

5

1) Setup -> Model Libraries

2) Model File (double clicks)

3) Select : models.scs

4) Select: C0

Setup Model Libraries

1

2

3

4


Setup Analyses (1/3)


1) Analyses -> Choose

2) In “Choosing Analyses” Window1. Analysis – dc

2. DC Analysis – Save DC Operating Point

3. Analysis – ac (see the next page)

4. AC Analysis -- Sweep Variable :

Frequency

-- Sweep Range

Start-Stop

Start: 1K Stop: 1G

-- Sweep Type

Logarithmic

-- Select : Point Per Decade 10

-- OK



After choosing analyses, you could see the dc & ac analyses setting and enable in “Virtuoso Analog Design Environment Window”

1) Outputs -> Save All

2) In “Save Options Window”-- Select signals to output (save)

select : all

-- OK

Setup Outputs


1) Simulation -> Netlist and Run

2) Results -> Annotate -> DC Node Voltage

3) Results -> Annotate -> DC Operating Points

4) Check your schematic & See what’s changed

5) Tools -> Calculator

Run Simulation & Check Results


1) Select – ac

2) Select – vf

3) Move your mouse to the schematic Window

4) Select the net “OUTP”

5) See what happen in your “Calculator Window”

Plot the output results (1/3)


1) Fill out “VF(“/OUTP”)-VF(“/OUTN”)

2) Select --dB20

3) Select -- plot



12

3

1) Check the Frequency Response in “Graph Window”

2) Find the 3dB Frequency



In “ Virtuoso Schematic Editor Window”

1) Delete the input voltages and the supply voltage

2) Save & Check

3) Create -> Cellview -> From Cellview

4) Click : OKin “Cellview From Cellview” and “Symbol Generation Options” Windows

Build the symbol from the schematic


1) After you implement this simple differential amplifier, you should understand:

• Building a schematic

• Simulating a design

• Checking the simulation results

• Creating a symbol from the schematic

2) You don’t need to write a report for this Lab. However, you need to tell the TA after you have done this example.

3) After the TA checks your results, you are finished with this lab.


ee4111 advanced analog electronics design -...

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