Hello,

I am designning a Switching regulator of continuous current mode constant off time topology. I am using spectre simulator for simulations. How can I perform STb analysis for this?

I tried the method of breaking the loop and inserting a probe but it is not giving the right results.

please help me with this

Hi,
   I am am doing the same project as you , I have difficulties in obtaining stability too. Did anyone manage to know how to break the stability? I have read the link but tried but fail.

I need to find the stability for both on time and off time.

Chviswanadh,

 If you have access to SpectreRF, periodic stability analysis, pstab, was added in MMSIM61.
It performs stability analysis on circuits with periodic operating points. I have used it on similar
circuits and the results seem reasonable. That is the predicted phase margin seems to track the
phase margin predicted by the pulse response. BTW, you could also use periodic ac analysis and
back out the stability from the open loop gain and phase.

                                                                                       Best Regards,

                                                                                         Sheldon