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Modeling >> Semiconductor Devices >> ADeff,ASeff - where to look in Spectre output?
https://designers-guide.org/forum/YaBB.pl?num=1158912073

Message started by ema_rf on Sep 22^nd, 2006, 1:01am

Title: ADeff,ASeff - where to look in Spectre output?
Post by ema_rf on Sep 22^nd, 2006, 1:01am

Hello,
I am struggling with a simulation of a circuit including BSIM43 model transistors in Spectre.
I suspect that my problem could be caused to AS and AD parameters being set or not (i.e. default hanling applies - for calculating ASeff, Adeff).

It would be very helpful if I could see the calculated values of ADeff and ASeff, however I cannot find where they would be output.

I have set
outputParameter info what=all where=rawfile
but I only get: "leff, rgbi, weff".

Also I tried to set 'element info' to 'all' - I get a lot of parameters but not adeff nor aseff.

After reading Spectre manual for 2 days now - I am stuck and running out of options to try.

So, perhaps you guys and gals had run into similar problem before :

Is it possible to see calculated ADeff and ASeff? If yes, where to look for/which flag to set to get it?

Any suggestion would be very much appreciated :)
Thanks,
Ema

Title: Re: ADeff,ASeff - where to look in Spectre output?
Post by Andrew Beckett on Oct 28^th, 2006, 1:35pm

If you do "spectre -h bsim4" you'll see all the output parameters and operating parameters that can be output by a bsim4 device. You'll see that adeff and aseff are not amongst these, so you can't get them...

The best you'll get are the various junction capacitances, which are the final result of the ad/as values used.

Regards,

Andrew.

Title: Re: ADeff,ASeff - where to look in Spectre output?
Post by ema_rf on Oct 30^th, 2006, 12:31am

Thak you for the info Andrew, you confirmed that adeff and aseff are not reachable :'( \
Pity... I suspected that but thought that I must have been missing something. Ah well ...
Thanks for your help,
Ema