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How many transistors must be used in a class B power amplifier?
| Q. | How many transistors must be used in a class B power amplifier to obtain the output for the full cycle of the signal? |
|---|---|
| B. | 1 |
| C. | 2 |
| D. | 3 |
| Answer» c. 2 |
How many transistors are used in Class A power amplifier?
These types of devices are basically two transistors within a single package, one small “pilot” transistor and another larger “switching” transistor.
How many transistors are used in push-pull amplifier?
two transistors
The circuit of the Push-pull amplifier contains two transistors, an NPN and a PNP transistor, as active devices. These transistors are anti-phased. One transistor gets forward biased during the positive half cycle of the signal while the other during the negative half of the cycle.
What are the disadvantages of class B push-pull amplifier Mcq?
What is the disadvantage of a class B push-pull amplifier? Explanation: A class B amplifier helps increase efficiency, and the figure of merit reduces. The q power dissipation reduces and cross over distortion increases.
Why are Class B amplifiers used in transistors?
The downside for this increased efficiency is that the transistor only amplifies half the waveform, therefore producing severe distortion. However, if the other half of the waveform can be obtained in some other way without too much distortion, then class B amplifiers can be used to drive most types of output device.
How does a push pull Class B power amplifier work?
The circuit of a push-pull class B power amplifier consists of two identical transistors T 1 and T 2 whose bases are connected to the secondary of the center-tapped input transformer T r1. The emitters are shorted and the collectors are given the V CC supply through the primary of the output transformer T r2.
What are the problems with a Class B power amplifier?
The two half cycles are reh-combined in this circuit via a centre tapped transformer, which reverses the action of the phase splitter transformer, to produce a complete sine wave in the secondary. The main problem with class B push pull output stages is that each transistor conducts for NOT QUITE half a cycle.
How to avoid crossover distortion in Class B amplifiers?
Crossover distortion is more of a problem in low and medium power class B amplifiers and the method used to eliminate it, is to use a class B amplifier that has some bias (and quiescent current) added so that the output transistors are conducting continually, and so avoiding the ‘dead zone’ of class B.