Designer’s Guide Community

nus_lin

Community Member

Offline

Posts: 48

how to plot gm/I0 and fT/I0 in analog artist
Mar 18^th, 2005, 8:02am

Dear guys,

I am using cadence, analog artist. the simulator i use is spectre. Now i need to sweep I0 and plot the change of transconductance and other parameters as the position of poles. can anybody told me how to do that?

there is an option like "setup output" from the pop-up window of simulator, is is the correct access to the parameters like gm, cgs,cgd?

Back to top

IP Logged

Andrew Beckett Senior Fellow Offline Life, don't talk to me about Life... Posts: 1742 Bracknell, UK	Re: how to plot gm/I0 and fT/I0 in analog artist Reply #1 - Mar 20^th, 2005, 2:35am This has come up a few times. A quick search (using the search button at the top of the Forum), for "gm sweep", setting the maximum post age to 600 days, gave this (amongst others): http://www.designers-guide.org/Forum/?board=circuit;action=display;num=107949162... Regards, Andrew.
Back to top	IP Logged

nus_lin Community Member Offline Posts: 48	Re: how to plot gm/I0 and fT/I0 in analog artist Reply #2 - Mar 20^th, 2005, 10:57pm Many thanks to you, andrew. but can you tell me more detail about where to put the include file? is there any old include file for spectre simulator? i cann't find any include file in my working directary, .
Back to top	IP Logged

Andrew Beckett

Senior Fellow

Offline

Life, don't talk to
me about Life...

Posts: 1742
Bracknell, UK

Re: how to plot gm/I0 and fT/I0 in analog artist
Reply #3 - Mar 20^th, 2005, 11:09pm

If you're using the analog design environment, choose Setup->Model Libraries, and then add the included file there. You can put it wherever you want, if you give the path to the file. Or you can set an include path (on the Setup->Simulation Files form) and then give a relative path on the model libraries form.

Regards,

Andrew.

Back to top

IP Logged

smchiu

Junior Member

Offline

Posts: 11

Re: how to plot gm/I0 and fT/I0 in analog artist
Reply #4 - Jul 23^rd, 2006, 1:34am

Hi Andrew,

May I by the way ask a similar question on this?

I want to plot gm/I vs Vgs-Vt instead of just vs Vgs. In Hspice, I use to use a command called .probe with PAR to set Vgs - Vt to a certain single variable to plot it. However, in SPECTRE, I am not sure what to do. Please advice.

Thanks a lot.
David.

Back to top

IP Logged

ADDA

New Member

Offline

Posts: 2

Re: how to plot gm/I0 and fT/I0 in analog artist
Reply #5 - Jul 24^th, 2006, 6:19am

You can use caculator to get what you want.

smchiu wrote on Jul 23^rd, 2006, 1:34am:

Hi Andrew,

May I by the way ask a similar question on this?

I want to plot gm/I vs Vgs-Vt instead of just vs Vgs. In Hspice, I use to use a command called .probe with PAR to set Vgs - Vt to a certain single variable to plot it. However, in SPECTRE, I am not sure what to do. Please advice.

Thanks a lot.
David.

Back to top

IP Logged