Push-pull amplifiers are a type of circuit used to amplify signals and suppress parasitic oscillations. They are widely used in audio systems, radio receivers and transmitters, and in other applications where signal amplification is required.
In its most basic form, a push-pull amplifier circuit uses two transistors or vacuum tubes to generate an output signal equal in amplitude to the input signal, but with opposite phase. The two transistors or tubes are connected in such a way that the output from each device is always 180 degrees out of phase with the other. This ensures that when one device is pushing, the other is pulling, thereby canceling out any parasitic oscillations that may occur.
A typical design for a push-pull amplifier circuit involves the use of two complementary transistors or vacuum tubes, such as a PNP and NPN transistor pair. By configuring these devices in a push-pull configuration, it is possible to achieve improved linearity and higher power output from the amplifier. Additionally, by connecting the two transistors or tubes together, it is possible to achieve an even greater efficiency as any gain in one device will be amplified by the other. This allows the push-pull amplifier to achieve power gains far beyond that of a single transistor or tube amplifier circuit.
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