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Simulators >> Circuit Simulators >> Root locus and Nyquist plots in cadence virtuoso ADE
https://designers-guide.org/forum/YaBB.pl?num=1611017360

Message started by iVenky on Jan 18^th, 2021, 4:49pm

Title: Root locus and Nyquist plots in cadence virtuoso ADE
Post by iVenky on Jan 18^th, 2021, 4:49pm

Hi,

Is there a way to plot root locus and Nyquist plots in Cadence virtuoso (for example, when we run stb analysis for a feedback system)?

Title: Re: Root locus and Nyquist plots in cadence virtuoso ADE
Post by Frank Wiedmann on Jan 19^th, 2021, 12:38am

You can do a Nyquist plot by plotting the imaginary part of the loop gain against its real part.

Title: Re: Root locus and Nyquist plots in cadence virtuoso ADE
Post by iVenky on Jan 28^th, 2021, 11:54am

Thanks, do you know if there is a way to do root locus for an stb simulation?
I would just like to find the location of poles/zeros based on an stb simulation and that's the purpose.

Title: Re: Root locus and Nyquist plots in cadence virtuoso ADE
Post by iVenky on Jan 29^th, 2021, 3:09pm

Is it fundamentally possible to find poles and zeros in stb analysis?

Title: Re: Root locus and Nyquist plots in cadence virtuoso ADE
Post by Frank Wiedmann on Feb 1^st, 2021, 1:08am

I don't think so. Spectre also has a pz analysis, but I have never used it.

Title: Re: Root locus and Nyquist plots in cadence virtuoso ADE
Post by iVenky on Feb 1^st, 2021, 7:53pm

I see. Thanks! I wish there was a way to find the location of poles and zeros approximately with stb analysis if I input an estimate of number of poles and zeros in the system.