What types of power amplifiers are available

Time：

2023-03-27

A power amplifier mainly refers to an amplifier that amplifies power, sending weak input signals to a preamplifier circuit that amplifies to the extent that it can drive the signal amplitude of the power amplifier, and then the subsequent power amplifier circuit drives other devices. It is mainly used to amplify the current of a large signal to achieve the purpose of power amplification. Today, let Aetna Electronics introduce the types of power amplifiers.
1、 Pure Class A power amplifier
Also known as a Class A power amplifier, it is mainly an amplifier in the form of fully linear amplification. When a Class A power amplifier is operating, the positive and negative channels of the transistor will be in a normally open state, causing more power to be consumed as heat.
2、 Class B power amplifier
Also known as a Class B power amplifier, it is also a linear amplifier, and its operating principle is completely different from that of a pure Class A power amplifier. The positive and negative channels of the transistor are closed when the Class B power amplifier is operating. When the positive phase signal comes over, only the positive phase channel operates, while the negative phase channel is closed. The two channels do not operate simultaneously, so there is no power loss for the part without a signal. However, when the positive and negative channels are turned on and off, there will be crossover distortion, especially at low levels. Therefore, Class B power amplifiers are not truly high fidelity power amplifiers.
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3、 Class A and B power amplifier
Also known as a Class AB power amplifier, this is a design that is compatible with Class A and Class B power amplifiers. When there is no signal or the signal is very small, the positive and negative channels of the transistor are normally open, and although there is a loss of power, it will not be as severe as Class A. When the signal is in positive phase, the negative phase channel is normally open before the signal becomes stronger, but when the signal becomes stronger, the negative channel is closed. When the signal is in negative phase, the positive and negative channels operate in the opposite direction. The drawback of class AB power amplifiers is that they can exhibit crossover distortion, but both efficiency and fidelity are better than class A and class B power amplifiers.
Antai ATA-4012 High Voltage Power Amplifier:
ATA-4012 High Voltage Power Amplifier Index Parameters
Figure: ATA-4012 High Voltage Power Amplifier Index Parameters
4、 Class D power amplifier
The operating principle of Class D amplifiers is based on switching transistors, which can be fully turned on or off in a short time. The two transistors do not conduct simultaneously, so there is little heat. Class D amplifiers are divided into three stages: input switching stage, power amplification stage, and output filtering stage. Class D amplifiers require two MOSFETs, and when one MOSFET is fully turned on, its transistor voltage drop is very low; When the MOSFET is completely turned off, the current flowing through the tube is 0. The switching speed of two MOSFETs is very fast, the efficiency is very high, and the heat generated is very low, so there is no need for a large radiator.
5、 Class T amplifier
The power output circuit and pulse width modulation of a class T power amplifier are the same as those of a class D power amplifier, while the power transistor also operates in a switched state, with an efficiency comparable to that of a class D power amplifier.

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