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The best way to simulate full-diff opamp with sc-cmfb?

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tony_taoyh

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Does anybody know how to do the AC simulation for fully-differential OTA with sc-cmfb?

This is what I have heard:
1) use vcvs to model the sc-cmfb;
however, what should I put the gain for the vcvs?
A very large value?
Please look at the attachment for the schematic.

2) Use the pac (in spectre)

Thanks a lot.
 

The gain is the voltage divided of the capacitor of cmfb and the total parasitic capacitor at node bias_cm, so it's less than 1.
 

hi, tony_taoyh

it is difficult to set the gain of vcvs. my suggestion is to use the ct-cmfb replacing the sc-cmfb, and set the resistors enough large. retain the hold capacitors between output and bias_cm.
 

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