what is inside an op amp
The final odd circuit within the op amp is shown in green. Here, the two resistors bias the transistor in what would seem to be an unusual way, since there is no apparent signal input to the base of the transistor. To understand its purpose, assume zero base current for a moment, and a V BE of 0.625 volt.he final odd circuit within the op amp is shown in green. Here, the two resistors bias the transistor in what would seem to be an unusual way, since there is no apparent signal input to the base of the transistor. To understand its purpose, assume zero base current for a moment, and a V BE of 0.625 volt.