Distortion in power amplifiers, Part V: output stages

From earlier work in this series, distortion from the small-signal stages may be kept to levels that will prove negligible compared with distortion from a closed-loop output stage. Similarly, future work in this series will show that distortion mechanisms 4 to 7 from my original list (EW + WW, July 93) can be effectively eliminated by lesser-known but straightforward methods. This leaves the third mechanism in its three components as the only distortion that is in any sense unavoidable: Class-B stages free from crossover artifacts are not exactly commonplace.

This is a good place to introduce the concept of a blameless amplifier, one designed so that all the easily-defeated distortion mechanisms ...

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