How can I get verilog-A code of RPI a-Si TFT model and RPI poly-Si TFT model?

You don’t need Verilog-A models for these - they are built into Spectre. See “spectre -h atft” and “spectre -h psitft” for details in the models (they’re in the documentation too).

Andrew

Thank you so much!

I want to run a simulation after drawing the circuit using cadence virtuoso, but when drawing the circuit in virtuoso, I couldn't find "spectre -h atft"  and "spectre -h psitft".

(They are not in libraries like analoglib.)

How can I use "spectre -h atft" and "spectre -h psitft" when drawing circuits in cadence virtuoso?

Sincerely,

yysunj.

You need to run the "spectre -h atft" from the UNIX command line, as it's invoking the help for the spectre command.

To use these models, you'd need a model file which defines the specific parameters for the TFT models. This would normally come from the foundry producing the process and sets the model parameters to match the transistor characteristics. This would be in a file (e.g. models.scs - the filename could be anything) and of the form:

model nchtft atft type=n tox=1.1e-7 

and so on The precise parameters would be drawn from the listed model parameters in the "spectre -h atft" Model Parameters section, and appropriate for the technology. The sample statement above defines a model called nchtft which is a type of atft for an n transistor, and just sets the oxide thickness. Every other parameter I left at default (which is pretty unlikely to be correct for whatever technology you're trying to model).

Then you could use nmos4 (or pmos4) symbol from analogLib and set the model name to nchtft (or whatever you called it) and the width and length of the transistor appropriately. Then reference the model file from within the Analog Design Environment using Setup->Model Libraries, and all should run. There's a similar discussion (albeit about a PSPICE model, but the principle is the same) here (this also talks about creating your own copy of the transistor symbol and setting the model name in the CDF so that you don't have to set it each and every time you use it).

Andrew

Thank you so much!

Have a nice day! 

Sincerely,

yysunj

Dear Andrew,

As you say, I have tried to type "spectre -h atft" at the UNIX command line. (Please look at below image.)

But, I have not yet reached spectre -h atft model.

How can I access atft model using UNIX command line?

Thanks,

yysunj.

That's not the UNIX command line. That's the entry box in the Virtuoso command interpreter window (CIW).

The UNIX command line is the terminal you started virtuoso from.

Andrew.

Thank you so much!

Your advice is very helpful to me.

yysunj