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Cadence Setup for ECE 5/413: Radio Frequency IC Design
Login to the ENGR server ece-ecegrad.ece.uidaho.edu using X2Go+Mate Client. Linux and Mac users can use ssh instead of the X2Go client. They can do this with
ssh -XY [username]@ece-ecegrad.ece.uidaho.edu
Setting up Cadence Libraries
0) Open the .bashrc file in your home directory
cd gedit .bashrc
Add the following lines to the .bashrc file in your home directory
export CDSHOME=/usr/local/cadence/installs/IC617 export CDS_Netlisting_Mode=Analog
Refresh the bash shell
source .bashrc
1) Create and go to your course work directory e.g. ece513. Better create a new directory for every course.
cd mkdir ece513 cd ece513
All work by the user should be performed in this circuit design directory. You can start Cadence Virtuoso by using the following command in your work directory.
virtuoso &
Creating a new Library
The Library techfile contains all required techfile information.
To create a new library that uses an attached techfile, use the command File→New→Library from either the CIW or library manager and select the Attach to an existing techfile option.
For 45nm CMOS, select the gpdk045 library when asked for the name of the Attach To Technology Library.
When using model files directly (such as 90nm CMOS in this course), select the default cdsDefTechLib library when prompted to Attach To Technology Library.
Simulation Models
45nm CMOS Models
1) Create a “cds.lib” file. Using any text editor the following entry should be put in the cds.lib file:
INCLUDE /home/vsaxena/pdk/gpdk045_v_5_0/cds.lib
2) Use the command in the terminal to create a softlink to the models directory
ln -s /home/vsaxena/pdk/gpdk045_v_5_0/models
3) You should be ready to start Cadence Virtuoso now!
virtuoso &
4) You can find the PDK documentation at
/home/vsaxena/pdk/gpdk045_v_5_0/docs
If you have setup everything correctly, simulation models should be automatically loaded. However, they can be found at:
/home/vsaxena/pdk/gpdk045_v_5_0/models
90nm CMOS Models
The 90nm CMOS models are located in the /home.vsaxena/pdk/models/ibm90nm.scs file.
You should instantiate the 'nbsim4' and 'pbsim4' devices from analogLib and point them to 'CMOSN' and 'CMOSP' models respectively. The above spectre model is all that you need to include in your simulation setup.
Scalable Inductor Model
The scalable inductor model is located on the server. Add the following line to the cds.lib file in your ece513 work directory
DEFINE RFIC2013 /home/vsaxena/pdk/models/RFIC2013
The cell to use is ind_scale. Use the simulation testbench tb_ind_scale to plot s-parameters for the inductor model. Read more in the textbook Chapter 4 on inductor modeling.
Tutorials
I-V and Parametric Sweeps - Thanks to Jubayer!
