See my response on another thread - this should answer
your question:

http://www.designers-guide.com/Forum/?board=circuit;action=display;num=107949162...

Regards,

Andrew.

Having created the file, you can then specify it under the
Setup->Model Files in the "spectre" interface in the Analog
Design Environment (Model files can be any spectre syntax
include file).

Regards,

Andrew.

Create a file somewhere, called (say) "saveit.scs"

The contents of this file should be:
Code:

// additional things to save
save M1:gm
// or could  miss out the :gm bit to save all op point
// info for M1
 

The above M1 should reflect the instance name of the transistor in the netlist.

Then in the Setup->Model Files form, add the path to the saveit.scs file in the list of files included.

Set up your transient analysis as usual, and then run the simulation. Then use the results browser (Tools->Results Browser), to navigate to your results, and you should be able to find the operating point data for the device you've saved.

A little more info is in the other thread I referred to a while ago.

Sorry for not giving absolute step by step details, but I'm in a hotel and doing this from memory, and also I'm assuming some basic level of competance with the Analog Design Environment.

Regards,

Andrew.

Hi Andrew,

Can you tell me how to plot gm vs. length for example? I know how you can get gm from the above method, however how do you sweep the length. I tried calling it a variable and doing a dc sweep but spectre did not allow me to do.

Thanks

One other question, how do you get lambda and Kappa (u_nC_ox) and plot it against some sweep variable? Sure you can compute lambda=1/rds*Id and kappa=gm^2/(2*Id*W/L), but is there other way?

Thanks
Thanks