I am designing a fully differential amplifier for the first time. I would design the CMFB for the OTA shown in image below
I would use continuous time CMFB, while all the references I have only discussed the SC CMFB for this circuit. If any one can help me I will be thankful for him
But actually I dont want to use the resistors in my design since it take a lot of space and I am not intending to design a buffer for driving the small one . rather I would like to use the Differential CMFB shown in the image below but my problem I dont know wherew should I connect the F.B signal with this OTA circuit
hi, but i think for the class AB output stage this kind of CMFB is not good, it has the linearity problem at large signal swings, I prefer to use resistive one for continous time output stage CMFB.
can you tell me which paper is that talks about SC-CMFB for class AB output stage? i think it's very hard to get high CMFB gain for that 2nd stage to use SC CMFB.
thanks!