I´d like to do a pz simulation of a circuit to see the pole movement under different operating conditions.
To do so I did a stb analysis first.
Then I compared the location of the poles from stb analysis to the ones gotten by the pz analysis.
And unfortunatelly they are totally different.
What could be the reason for this?
I assume that the operating conditons are the same.
Oh I forgot. I´m using Cadence 6.1.5
stb analysis is looking at the loop gain of a specific loop (that you point at) - not producing poles and zeros. The pz analysis is analyzing the poles and zeros of the entire circuit, not just one loop. So it's an apples and pears comparison.