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OP Amp with CMFB stability

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Shady Ahmed

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I am designing a 2 stage Class AB op-amp , with CMFB network, The OP-Amp will be used as an integrator (with Capacitive -ve feedback).


But i have a question regarding the stability , GBW and PM calculations:
I am not sure whether i need to check the stability and PM condition,

1) Using phase and gain of the differential output . With NO cmdbprobe connected

2) Using the cmdmprobe (i inserted it before the averaging resistances).

3) Using the cmdmprobe after connecting the feedback capacitor. (for the integrator)

Here is my schematic with cmdmprobe connected
OP-Amp schematic.pngIntegrator.png
 

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