Hello,

  I am simulating a switched-capacitor amplifier, it is the simple and typical fully differential SC-amp, with the gain of 2. At the beginning, I use continuous CMFB, it works well. Now I am trying to use SC-CMFB as shown in the book (by Paul R. Gray), but I always have the problem of converge for both Trans. and PSS simulation. Then the simulation is crashed.

  I am using Spectre, in transient simulation, I set the "skip dc", I use "gear2only", also I set ic "all".

   Does anybody have the experience about simulating SC-CMFB?

   Thank you.

Hello Boe,

   Thank you for your reply.

   I solve the problem, because I am using the ideal switch from analogLib, I set the on-resistor and off-resistor as the default value, that is crazy. Now I change them to the reliable one. Spectre works.

   Jacki