pole-zero analysis with Matlab

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sutapanaki

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Hi,

Can someone tell me how to do a pole-zero analysis (extraction) with Matlab? I assume there should be a function for that.
Say, I can get from circuit simulation magnitude, phase and frequency points (or correspondingly Re, Im and frequency points). How can I use this to find the poles and zeros of the circuit?
I tried to run pole-zero analysis in Eldo but it crashes for my circuit.
Thanks
 

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