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Re: How to plot MOSCAP C-V curve using Cadence Spectre in AD
for moscap, C-V fullfill the formular: V=I*Z=I/(jwc) , so |C|=|I/(w*V)|
if V=1,w=1 then C=I
Insert a dc voltage source in the gate of moscap, set the "ac amplitude" to 1 and dc voltage to "Vin". Do ac simulation and sweep the parameter of Vin from -2V to 2V at frequency "1". Plot ac current "I" of the terminal "G" and the C will be the same as I.
Re: How to plot MOSCAP C-V curve using Cadence Spectre in AD
sharpsheep said:
Insert a dc voltage source in the gate of moscap, set the "ac amplitude" to 1 and dc voltage to "Vin". Do ac simulation and sweep the parameter of Vin from -2V to 2V at frequency "1".
Lorry
Or you could step V in a DC OP simulation, Parametric
Analysis, and just plot op(cgg). If you're not set on directly
emulating the measurement setup.
If you set the measurement signal large then your C will be
changing all the time, and since it's nonlinear you can't just
go and average it. Though in AC analysis it's all bogus, if
you ran a transient you'd see C varying across the cycle at
1V amplitude (especially if you're swinging across inversion
threshold). Setting input amplitude to 1 for AC is just a simple
default and often makes the output amplitude be a useful
datum directly (like, if input=1 then output amplitude also
= gain).
I'd be applying transient stimulus amplitude that is maybe 1%
of full span, if I wanted 1% kind of accuracy where things are
changing a lot.
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