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spectre stb analysis to show poles and zeros

apple419

My system: IC6.1.5

  In stb analysis, based on the bode plots I am able to approximately see where the poles and zeros are. But sometimes I would like to know the exact locations of poles and zeros. Is there a way to print out all the poles and zeros?

  I know pz analysis can show poles and zeros, but in a feedback system I need to break the loop so that what pz analysis shows are the real open loop gain poles and zeros. So how to break the loop in pz analysis? I know stb has this built in...

 

thanks for helping. 

Parents

  • They're not really the same thing. The pz analysis is computing the poles and zeros of the entire circuit, not just a specific loop gain. The stb analysis computes the loop gain (it does not "break" the loop) - they are different algorithms that work in different ways - so there's not really a way to do this (right now).

    There have been some requests to implement this, but no plans to do so right now (not sure about the feasibility).

    Regards,

    Andrew.

Reply

  • They're not really the same thing. The pz analysis is computing the poles and zeros of the entire circuit, not just a specific loop gain. The stb analysis computes the loop gain (it does not "break" the loop) - they are different algorithms that work in different ways - so there's not really a way to do this (right now).

    There have been some requests to implement this, but no plans to do so right now (not sure about the feasibility).

    Regards,

    Andrew.

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