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Disadvantages Of Opamp

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3 Threads found on Disadvantages Of Opamp
can anyone tell me about the advantages and disadvantages of opamps designed with bjts vs and that designed with CMOS???
I would like to know the advantages or the disadvantages of an opamp used in the feedback or feedforward circuitry. Also, is there a change in gain when opamp is used in the above two configurations. I have attached an example which shows a feedback and feedforward circuit. The values of the resistors are just an example.
What are the disadvantages of subthreshold PMOS opamps? thanks