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Line 42: A push–pull amplifier produces less [[distortion]] than a single-ended one. This allows a [[Power_amplifier_classes#Class_A\|class-A]] or [[Power_amplifier_classes#Class_AB\|AB]] push–pull amplifier to have less distortion for the same power as the same devices used in single-ended configuration. [[Power_amplifier_classes#Class_AB\|Class AB]] and [[Power_amplifier_classes#Class_B\|class B]] dissipate less power for the same output than class A; distortion can be kept low by [[negative feedback]] and by biassing the output stage to reduce crossover distortion. A class - B push–pull amplifier is more efficient than a class-A power amplifier because each output device amplifies only half the output waveform and is cut off during the opposite half. It can be shown that the theoretical full power efficiency (AC power in load compared to DC power consumed) of a push–pull stage is approximately 78.5%. This compares with a class-A amplifier which has efficiency of 25% if directly driving the load and no more than 50% for a transformer coupled output.<ref name=Yunik73>Maurice Yunik ''Design of Modern Transistor Circuits'', Prentice-Hall 1973 {{ISBN\|0-13-201285-5}} pp. 340-353</ref> A push–pull amplifier draws little power with zero signal, compared to a class-A amplifier that draws constant power. Power dissipation in the output devices is roughly one-fifth of the output power rating of the amplifier.<ref name=Yunik73/> A class-A amplifier, by contrast, must use a device capable of dissipating several times the output power. The output of the amplifier may be direct-coupled to the load, coupled by a transformer, or connected through a dc blocking capacitor. Where both positive and negative power supplies are used, the load can be returned to the midpoint (ground) of the power supplies. A transformer allows a single polarity power supply to be used, but limits the low-frequency response of the amplifier. Similarly, with a single power supply, a capacitor can be used to block the DC level at the output of the amplifier.<ref>Donald G. Fink, ed. ''Electronics Engineer's Handbook'', McGraw Hill 1975 {{ISBN\|978-0-07-020980-0}} pp. 13-23 through 13-24</ref>

Push–pull output: Difference between revisions