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)

thanks

In spectre itself, something like this would do the trick:

Code:

* 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).

Regards,

Andrew.