I initially thought you could do this with a bsource, something like:

Code:

//
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

rmeas (rop 0) bsource r=m1:vth*1000
imeas (rop 0) isource i=1u

save m1:ids rop

parameters start=0 stop=5 step=20m gsv=1
vgssweep sweep dev=vgs param=dc start=0.6 stop=2.0 step=0.2 {
    dcAnalysis dc dev=vds start=start stop=stop step=step
    }
 

(bsource could have been "resistor" in the above example).

However, this doesn't work. I then remembered that there is:

   PCR: 568208
 Title: Allow passing device operating point to bsource

to get this to work.

So it's not possible right now (assuming I've understood the question properly!)

Regards,

Andrew.

bsource is a generic dependent component, which can be a resistor, capacitor, inductor, voltage source or current source - dependent on expressions of voltages and currents. See spectre -h bsource for more details.

There is no component for it in analogLib - mainly because the expressions would confuse ADE - it tends to think that such expressions include design variables where you're actually referring to voltages at nodes in the design (say).

Mostly bsource gets used for device models - so you can create a subckt (or inline subckt) model and then include this as a model file, and have a corresponding symbol for that in DFII.

Regards,

Andrew.