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Hello,
Does anyone know which is the characteristic that defines an operational amplifier at one of the tree catategories (BJT, FET, CMOC)? Is the type of tranzistors that have on his input or in output or in both (in and out)?
Both.
As a fact there are many devices which use a mixed process.
For instance, the ubiquitous TL072 and TL074 have Jfet inputs and BJT in the remaining circuitry.
BiCMOS opamps are also fairly common. One of the earliest ones, the CA3140, has been around since the early 1970s.
Am I a smartie pants?
I recognised the LM741 opamp in your second attachment but I used it only one time and found its performance to be awful.
I did not learn about it in school because it was not invented yet.
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