Chapter 6. The Output Stage

Classes and Devices

The almost universal choice in semiconductor power amplifiers is for a unity-gain output stage, and specifically a voltage-follower. Output stages with gain are not unknown – see Mann[1] for a design with 10 times gain in the output section – but they have significantly failed to win popularity. Most people feel that controlling distortion while handling large currents is quite hard enough without trying to generate gain at the same time. Nonetheless, I have now added a section on output stages with gain to this chapter.

In examining the small-signal stages of a power amplifier, we have so far only needed to deal with one kind of distortion at a time, due to the monotonic transfer characteristics of ...

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