What is a class AB power amplifier?

Class AB amplifiers combine Class A and Class B to achieve an amplifier with more efficiency than Class A but with lower distortion than class B. This is achieved by biasing both transistors so they conduct when the signal is close to zero (the point where class B amplifiers introduce non-linearities).

Where is class AB amplifier used?

audio power amplifiers
The class AB amplifiers are using commonly in the audio power amplifiers. From the diagram the two transistors have the small amount of voltage which is 5 to 10\% of the quiescent current and the bias the transistor just above the cutoff point.

What is the advantage of Class A operation of an amplifier?

Advantages of Class A Amplifier It has high fidelity because of the output exact replica of an input signal. It has improved high-frequency response because the active device is ON full time, i.e. no time is required to turn on the device.

What is the difference between Class B and Class AB power amplifiers What are the advantages of push pull circuit over that of a single transistor amplifier?

The main benefit of push pull class B amplifier and class AB than class A is that their large efficceny. This benefit generally dominates the trouble of biasing the class AB push-pull amplifier to eradicate crossover distortion. As we know that efficiency is ratio between output power ac to dc input power.

What is the difference between Class B and Class AB power amplifiers?

Amplifier Classes (Short Summary) Class B: Push-pull; each device conducts over half the input signal swing. Class AB: Push-pull; each device conducts over slightly more than half the input signal swing to simplify crossover.

What is the difference between Class AB and Class D amplifiers?

The most common audio power amplifier operates in the Class-AB mode. It provides the greatest amount of output power with the least amount of distortion. The downside is that it consumes quite a bit of power. Class-D amplifiers are switches that are more efficient and produce less heat than their Class-AB equivalents.

How does class AB amplifier eliminate crossover distortion?

In the case of a class B/AB amplifier, crossover distortion can be reduced by using a slight forward bias in the base circuit such that the transistors are idling at a small output current. The forward bias causes the circuit to operate in class-AB mode, so both transistors are slightly on during crossover.