The Designer's Guide Community Forum

The Designer's Guide Community Forum
https://designers-guide.org/forum/YaBB.pl
Simulators >> Circuit Simulators >> pole zero analysis not use same method as stability analysis
https://designers-guide.org/forum/YaBB.pl?num=1236183632

Message started by PKing on Mar 4^th, 2009, 8:20am

Title: pole zero analysis not use same method as stability analysis
Post by PKing on Mar 4^th, 2009, 8:20am

I'm using stability analysis and pole-zero analysis in Eldo but I imagine this same question could apply to Spectre;

Stability analysis allows you to plot the loop gain and phase without breaking the loop by adding an inline source and the simulator uses the Middlebrook method. I still seem to need to break the loop though for the pole-zero analysis! The broken-loop bode plots from the pole-zero match the bode plots from the stability analysis as I'm modelling the real circuit. I would not be so confident though when non ideal input/output impedances are used in the real cct. Is there a way of using Eldo pole-zero analysis without breaking the loop?