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→Square-law push-pull: still haven't got the reference right, have I? Linear Audio Vol 1, by Ian Hegglun? |
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==== Square-law push-pull ====
The output devices, usually [[MOSFET]]s, are configured so that their [[Power-law#square-law|square-law]] transfer characteristics (that generate second harmonic [[Distortion]] is used in a single-ended circuit) cancel distortion to a large extent. That is, as the voltage across one transistor's gate-source voltage increases the remaining bias voltage to the complementary device is reduced by that amount and the drain current change in the second device approximately corrects for the non-linearity in the increase of the first. <ref> {{cite journal | author=Ian Hegglun | title=Practical Square-law Class-A Amplifier Design | Journal=Linear Audio - Volume 1}}</ref>
=== Push-pull tube (valve) output stages ===
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==== Ultra-linear push-pull ====
[[Pentode]]s and [[Tetrode]]s can have their [[screen grid]] fed from a percentage of the primary voltage on the output transformer, giving efficiency and distortion that is a good compromise between triode (or [[Pentode#Triode-strapped pentode circuits|Triode-strapped]]) power amplifiers circuits and conventional pentode or tetrode output circuits where the screen is fed from a relatively constant voltage source. See article: [[Ultra-Linear]].
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== See also ==
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