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Opamp issues

Posted by grhughes on May 19, 2012 at 07:19:43

In Reply to: If there is one detail I learned........... posted by Neff on May 19, 2012 at 06:34:11:

It's the output stage in most LSI opamps that make the things awful. To be integrated on the same chip the output topology has to be Class AB or B and never Class A or it would dissipate heat like gangbusters and crater the whole circuit. Also it's difficult to make a pnp complementary transistor that has the same low collector to base capacitance as the npn above it. They of course improved from generation to generation but they still can't compete with a discreet, tightly matched, burned in component opamp. We have learned much about input stage topology and cc source and sink topology in opamp design. They just don't have the headroom compared to a tube circuit. But it's quick and dirty and cheap. Ray

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