# Simulation for a NMOS-CAP

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#### kumar123

##### Member level 3
Hi Experts,

I would like to do an analysis on NMOS-CAP attached herewith what i try to do is extraction of DC capacitance that is viewd between terminals N1 and N2

can anybody suggest type of analysis to be done to get proper CV and IV characteristics in SPICE?

moreover for a good NMOS cap what would be ESR should it be low ?

apart from that could you please let me know is there anyway to find out ESR value for the attached figure from the SPICE simulation? if yes, what analysis has to be run ?

Thanks in advance for providing valueable information on this

Kumar

#### Hughes

You may use a dc current source to inject charge to the gate. Use .IC to set initial value:
Code:
IG 0 N1 1nA
M1 N2 N1 N2 N2 NMOS W= L=
.IC V(N1)=-1
Now do a transient analysis. From C=Q/V, you can calculate the C.

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