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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.
Push-Pull Amplifier Circuits using Transistors. A Push-Pull transistor circuit is an electronic circuit that uses active devices connected in a particular way that alternatively supply current and absorb from connected load whenever needed. It used to supply high power to the load.
Push-pull amplifiers use two “complementary” or matching transistors, one being an NPN-type and the other being a PNP-type with both power transistors receiving the same input signal together that is equal in magnitude, but in opposite phase to each other.
The schematic diagram for Push-Pull amplifier circuit consists of two transistor Q1 and Q2 which are NPN and PNP respectively. When the input signal is positive Q1 starts conducting and produce a replica of the positive input at the output.
Figure 1. A single-transistor Class B RF amplifier. Instead of using a high-Q tank, we could also remove the harmonic components of the Class B stage by forcing two half-sine wave pulses through the load in opposite directions. This is known as a push-pull amplifier.
To provide more current a simple push-pull transistor output stage can be added to increase the amplifiers drive capability. In this circuit, we add the 2N3904 and 2N3906 NPN/PNP transistor pair in a push-pull configuration to increase output current.
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