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Modeling >> Passive Devices >> Plot the CV curve using the spectre
https://designers-guide.org/forum/YaBB.pl?num=1170335948

Message started by kim57 on Feb 1^st, 2007, 5:19am

Title: Plot the CV curve using the spectre
Post by kim57 on Feb 1^st, 2007, 5:19am

hi all,

I use the spectre to simulate some capacitor, i need to plot the capacitance vs the supply voltage.
it's there anywhere for me to do so?? please help me if anyone know how to do that..
thanks

Title: Re: Plot the CV curve using the spectre
Post by Geoffrey_Coram on Feb 2^nd, 2007, 5:29am

Spectre allows you to do an ac sweep at a fixed frequency; do
spectre -h ac
and look at the "freq" parameter. Set it to 1/(2*pi) and put a voltage source with ac magnitude 1 on the capacitor. The imaginary part of the current is now exactly equal to the capacitance.

Title: Re: Plot the CV curve using the spectre
Post by aaron_do on Feb 7^th, 2007, 11:14pm

is there an easy way to plot just the current through Cgd, Cgs...etc

thanks,
aaron