raja.cedt
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hi, can you give complete spec so that people may think more about your problem. I think for your application two stage op amp will be good, single stage you cant drive mA load. whenever you put op amp in the -ve feedback then opamp inverting terminal will try to follow non inverting terminal but some times it fail because output common mode and input common mode is differ by large value, so while designing make sure that both are equal. Lets say you have 650mv at input and 1v is the ouput common mode then in the -ve feedback opamp offset voltage will be 350mv/(open loop dc gain).
thanks, Rajasekhar.
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