The internal schematic of an op amp can be overwhelming for those new to the topic. In this video we take apart a possible first stage of an op amp consisting of ten transistors, and reduce it step-by-step to familiar circuitry.
Before watching this video, you should watch the videos on differential amplifiers (parts 1 and 2), current mirrors, and active loads. These are all in the Op Amps playlist, preceding this video.
References: Operational Amplifiers and Linear Integrated Circuits: Theory and Application; Chapter 1 section 6, Chapter 2 sections 1 and 2.
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