What does class AB amplifier mean

Generally, according to the power amplifier, it can be divided into class a power amplifier, class B power amplifier, class C power amplifier, class AB power amplifier, and modern class D power amplifier. Today, let's focus on what class AB power amplifier means. Let's browse the following contents and think carefully!

What does class AB amplifier mean?

Class AB power amplifier is a design compatible with the advantages of class A and class B power amplifiers. When there is no signal or the signal is very small, the positive and negative phase channels of the transistor are always open, and the power will be lost, but it is not as serious as class a power amplifier. When the signal is positive phase, the negative phase channel is always open before the signal becomes strong, but when the signal becomes strong, the negative phase channel is closed.

What are the disadvantages of class AB Power Amplifiers?

The disadvantage of class AB power amplifier is that it will produce a little cross distortion, but compared with its efficiency ratio and fidelity, it is better than Class A and class B power amplifiers. Class AB power amplifier is also the most widely used design in car audio at present. When the signal is negative, the working directions of positive and negative channels are opposite.

In addition to class AB power amplifiers, there are also modern class D power amplifiers

The working principle of class D power amplifier is based on switching transistor, which can be fully turned on or off in a very short time. The two transistors do not turn on at the same time, so they produce very little heat. The efficiency of this type of amplifier is very high (about 90%), which can reach 100% ideally, while the efficiency of class AB amplifier is 78.5%.

Conclusion: for class AB power amplifier, enthusiasts still need to know. After all, it is a kind of power amplifier. Because the utilization rate of class AB power amplifier is also very high, it must have its significance.