The Designer's Guide Community
Welcome, Guest. Please Login or Register. Please follow the Forum guidelines.
Jun 14th, 2024, 6:24am
Pages: 1
Send Topic Print
dc sweep on two sources (Read 3902 times)
mike mcfarland

dc sweep on two sources
May 13th, 2003, 7:56am
hey is it possible to get spectre to dc sweep two sources and then plot the curves with awd? like i'm trying to get output characteristics for this transistor and i just want to sweep vds for different values of vgs. is it even possible to do this from the analog artist window in cadence's icfb software? (doesn' t look like it so i just went and tried to do it from spectre directly with equally little luck)

Back to top
  IP Logged
Senior Member

Posts: 262

Re: dc sweep on two sources
Reply #1 - May 13th, 2003, 10:28am
I would try the Parametric Plotter. It's fairly straightforward to use. I would set up one sweep in the DC analysis then use the parametric tool to do the other. I think you can even perform both sweeps from the parametric tool if you wish.
Back to top
View Profile   IP Logged
Andrew Beckett
Senior Fellow

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

Posts: 1742
Bracknell, UK
Re: dc sweep on two sources
Reply #2 - May 14th, 2003, 6:22am
In spectre itself, something like this would do the trick:

* Author     A.D.Beckett
* Noddy analysis to generate id vs vds and vgs curves for a simple
* level 1 transistor.

model nch mos1 type=n vto=1 kp=16u gamma=1.3 lambda=0.01 \
	 phi=0.7 pb=0.80 mj=0.5 mjsw=0.3 cgbo=200p cgso=350p cgdo=350p \
	 cj=300u cjsw=500p ld=0.1u tox=80n \
	 af=1 kf=3.1e-24

m1 (drain gate 0 0) nch w=20u l=0.8u
vgs (gate 0) vsource dc=1
vds (drain 0) vsource dc=1

save m1:ids

sweepvgs sweep dev=vgs param=dc start=0 stop=2 step=200m {
    dcAnalysis dc dev=vds start=0 stop=5 step=20m

However, as has been noted, you can do this with a combination
of a dc sweep in artist (of the vds, say), and then use the Tools->Parametric analysis to sweep the vgs (you'll need to put a design
variable on the vgs voltage source to do that though).


Back to top
View Profile WWW   IP Logged
Pages: 1
Send Topic Print
Copyright 2002-2024 Designer’s Guide Consulting, Inc. Designer’s Guide® is a registered trademark of Designer’s Guide Consulting, Inc. All rights reserved. Send comments or questions to Consider submitting a paper or model.