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What is a complementary class B push pull amplifier?
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. …
What is the drawback of a complementary symmetry push pull amplifier?
Disadvantages. The disadvantages of Complementary symmetry push pull class B amplifier are as follows. It is difficult to get a pair of transistors (NPN and PNP) that have similar characteristics. We require both positive and negative supply voltages.
Where are push pull amplifier used?
Push pull amplifiers are commonly used in situations where low distortion, high efficiency and high output power are required. The basic operation of a push pull amplifier is as follows: The signal to be amplified is first split into two identical signals 180° out of phase.
Why is it called a push pull amplifier?
The circuit is called a Push-Pull because one transistor pushes in one direction while the other pulls in another direction. Both transistors are NPN types in this case. A common small signal BJT is the 2N2222 NPN Transistor [low power].
Which is Darlington Class AB push pull amplifier?
The Darlington class AB push-pull amplifier is shown in the below figure. 7.19 There is a need of 4 diodes in the bias circuitry to fulfill the 4 base-emitter junctions of 2 Darlington pair. The complementary Darlington also called Sziklai pair.
What makes a push pull amplifier more efficient?
It contains a pair of active devices such as a complementary pair of transistors. Here one transistor supply’s the power to the load from the positive power supply and the other sink’s the current from the load to the ground. These amplifiers are more efficient than the single-ended class-A amplifiers.
Is the push pull circuit normal or complementary?
The upper portion of the push-pull circuit is normal Darlington pair and the lower portion is complementary Darlington. So, friends, it is a detailed post about CLASS B and Class AB Push-Pull Amplifier if you have any query ask in comments.
How is a third transistor added to a Darlington pair?
A third transistor can be added to a Darlington pair to give even higher current gain, making a Darlington triplet. The emitter of the second transistor in the pair is connected to the base of the third, as the emitter of first transistor is connected to the base of the second, and the collectors of all three transistors are connected together.