Yes, I just put this with just one transistor to do it fastter but in a good desing as you said it must be a current mirror.I'd consider changing R1 and Q3 and Q4 for actual current mirrors
Where I can read about it? I means a good reading stuff. For example in all book I had read, like Schilling / Belove I did not find stuff like the build of amp op, just the commun things.It's good to read about op amp design
Why not using a monolithic amplifier IC like "TDAxxx" or "LMxxx" ?
Or is it a challenge to build it on your own?
You are rigth, and the diodes will be near the head dissipator.An audio amplifier or opamp use diodes like you did in one circuit or a transistor to replace the diodes to also conduct when they are heated by the darlingtons to cancel the thermal runaway. They replace your resistor R3.
Do an ampliffier which can deliver more than 1 ampere. But really what I want is to design it and understand the inner workings. Thanks for the books recommendation! looks nice.What is the goal/main function of the design you're basing this op amp on, please? I'm curious as I've only seen/paid attention to op amps which have current mirrors as the loads for the differential pair, besides the mirror for the tail current. Thanks.
At what potential must be Vbias to have the max gain and min offset?
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