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The Designer's Guide Community Forum › Simulators › Circuit Simulators › Root locus and Nyquist plots in cadence virtuoso ADE
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Root locus and Nyquist plots in cadence virtuoso ADE (Read 375 times)
iVenky
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Root locus and Nyquist plots in cadence virtuoso ADE
Jan 18th, 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)?
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Frank Wiedmann
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Re: Root locus and Nyquist plots in cadence virtuoso ADE
Reply #1 - Jan 19th, 2021, 12:38am  
You can do a Nyquist plot by plotting the imaginary part of the loop gain against its real part.
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iVenky
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Re: Root locus and Nyquist plots in cadence virtuoso ADE
Reply #2 - Jan 28th, 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.
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iVenky
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Re: Root locus and Nyquist plots in cadence virtuoso ADE
Reply #3 - Jan 29th, 2021, 3:09pm  
Is it fundamentally possible to find poles and zeros in stb analysis?
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Frank Wiedmann
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Re: Root locus and Nyquist plots in cadence virtuoso ADE
Reply #4 - Feb 1st, 2021, 1:08am  
I don't think so. Spectre also has a pz analysis, but I have never used it.
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iVenky
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Re: Root locus and Nyquist plots in cadence virtuoso ADE
Reply #5 - Feb 1st, 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.
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