cadence setup v2

7/30/2019 Cadence Setup V2

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Cadence Setup

This short tutorial shows how to setup basic cadence environment. Make sure you are

using connected to solarium.utdallas.edu. Make a directory named EECT6326 for the

class:

mkdir ~/EECT6326

You need following six files to set up your Cadence environment:

1) .cdsint

2) .cdsenv

3) cds.lib

4) profile.ic-5

5) spectre250.scs

6) MOS_Model.scs

You can copy these from the following directory:

cp /home/eng/b/bre100020/Fall12/EECT6326/* ~/EECT6326/

Type "ls" in your terminal to check that all six files have been successfully copied, then

change the cdsinit and cdsenv file names to have dots in front of them.

mv ~/EECT6326/cdsinit ~/EECT6326/.cdsinit

mv ~/EECT6326/cdsenv ~/EECT6326/.cdsenv

This step is IMPORTANT. .cdsenv and .cdsinit are the two file which define the

Cadence environment when you start the program.

Now, you are able to start icfb. First, you need to source the profile file every time

before starting icfb. Secondly, icfb must be started under project directory because wecopied .cdsenv and .cdsinit there.

cd ~/EECT6326/

source profile.ic-5

icfb&

After that, you will see the command interpreter window (CIW).


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Go to Tools in CIW and click on Library Manager

Go to File in Library Manager -> New -> Library


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Enter the name of your library for the project (e.g. ADC_proj). Then chose Dont need

a techfile. Then click OK.

Go to File in CIW -> New -> Cellview

You will see the schematic window. For nmos and pmos transistors, go to Add ->

Instance (the default hotkey is i)


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Use nmos4 and pmos4 foranalogLib, remember you need to change the Modelname to be NMOS and PMOS as follows.


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Here I build a simple inverter to show the simulation flow.

Go to Tools -> Analog Environment to open Analog Design Environment. Click on

Analyses in Analog Environment.


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Choose transient analysis

After simulation is done, go to result Results -> Direct Plot -> Main from and select

input and output nodes. Then you could see the input and output voltage waveform.


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Small Signal Gain Simulation

Create a new schematic called amplifier in your ADC_proj library and draw the

following circuit:


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For the input voltage source, set the DC voltage to 2 and the AC Magnitude to 1.

Now start the Analog Design Environment and add an AC analysis as shown:


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Go to Outputs->To Be Plotted->Select On Schematic and click on the output node.

After you run the simulation the following plot should appear:

The value plotted here is the small signal gain of your circuit.

cadence setup v2

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