Vcntrl and Vs both as 0.1 v.
net03 is the gate to V node and net4 is the node of G to Vg.
-------NETLIST----------
simulator lang=spectre
global 0
parameters vcntrl=100m Vg=100m
View name: schematic
C1 (net4 net03 0) nvar_12rf w=(2u) l=(2u) ny=3 nx=3 m=1
Vg (net4 0) vsource dc=Vg mag=1m type=sine freq=60G
Vcntrl (net03 0) vsource dc=vcntrl type=dc
simulatorOptions options reltol=1e-3 vabstol=1e-6 iabstol=1e-12 temp=27 \
tnom=27 scalem=1.0 scale=1.0 gmin=1e-12 rforce=1 maxnotes=5 maxwarns=5 \
digits=5 cols=80 pivrel=1e-3 sensfile="../psf/sens.output" \
checklimitdest=psf
ac ac freq=60e9 param=Vg start=10m stop=300m step=10 annotate=status
dcOp dc write="spectre.dc" maxiters=150 maxsteps=10000 annotate=status
dcOpInfo info what=oppoint where=rawfile
dc dc param=vcntrl start=10m stop=300m step=0.1 oppoint=rawfile \
maxiters=150 maxsteps=10000 annotate=status
modelParameter info what=models where=rawfile
element info what=inst where=rawfile
outputParameter info what=output where=rawfile
designParamVals info what=parameters where=rawfile
primitives info what=primitives where=rawfile
subckts info what=subckts where=rawfile
save C1:1 C1:2
saveOptions options save=allpub