![]() DC current is cancelled in the output, allowing a smaller output transformer to be used than in a single-ended amplifier. Symmetrical construction of the two sides of the amplifier means that even-order harmonics are cancelled, which can reduce distortion. ![]() ![]() The output power that can be achieved is higher than the continuous dissipation rating of either transistor or tube used alone and increases the power available for a given supply voltage. Push–pull outputs are present in TTL and CMOS digital logic circuits and in some types of amplifiers, and are usually realized by a complementary pair of transistors, one dissipating or sinking current from the load to ground or a negative power supply, and the other supplying or sourcing current to the load from a positive power supply.Ī push–pull amplifier is more efficient than a single-ended "class-A" amplifier. This kind of amplifier can enhance both the load capacity and switching speed. A Class B push–pull output driver using a pair of complementary PNP and NPN bipolar junction transistors configured as emitter followersĪ push–pull amplifier is a type of electronic circuit that uses a pair of active devices that alternately supply current to, or absorb current from, a connected load.
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