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Audio Engineering Explained by Douglas Self

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CHAPTER 8

Power Amplifier Architecture and Negative Feedback

AMPLIFIER ARCHITECTURES

This grandiose title simply refers to the large-scale structure of the amplifier; that is, the block diagram of the circuit one level below that representing it as a single white block labeled Power Amplifier. Almost all solid-state amplifiers have a three-stage architecture as described below, though they vary in the detail of each stage. Two-stage architectures have occasionally been used, but their distortion performance is not very satisfactory. Four-stage architectures have been used in significant numbers, but they are still much rarer than three-stage designs, and usually involve relatively complex compensation schemes to deal with the fact that there ...

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