Explain the working of push-pull amplifier with the help of circuit diagram.
Answers
In this scheme no transistor remains on for the entire cycle, giving rest
and time for circuit to cool down. This makes a power efficient amplifier circuit but leads to a
different type of nonlinearity known as crossover distortion.
The opamp
merely acts as a buffer which helps in reducing the loading of input capacitor/resistor
network which has been placed in the circuit to filter out any dc bias voltage.
The forward voltage merely drops from 0.7 volts to 0.5 volts. The diodes continue to
provide the same bias voltage of 1.4 volt. The result is that the circuit drifts into class AB
operation. This results in more heat dissipation through transistors enhancing the problem of
forward voltage drop.
This is solved by insertion of temperature-compensation feedback resistor.
Explanation:
Push-Pull Amplifier is a power amplifier which is used to supply high power to the load. It consists of two transistors in which one is NPN and another is PNP. One transistor pushes the output on positive half cycle and other pulls on negative half cycle, this is why it is known as Push-Pull Amplifier.