An article to understand the difference between voltage amplifiers and power amplifiers

Time：

2023-03-27

Many people are always confused about voltage amplifiers and power amplifiers. In practical applications, voltage amplifiers and power amplifiers play the same role. Today, let Aetna Electronics take a look at the difference between power amplifiers and voltage amplifiers.
The main difference between a power amplifier and a voltage amplifier is that the output impedance of the power amplifier is low, while the output impedance of the voltage amplifier is high.
Power amplifier and voltage amplifier
Figure: Power amplifier and voltage amplifier
The main differences between power amplifiers and voltage amplifiers are:
The main differences between power amplifiers and voltage amplifiers
Figure: Main differences between power amplifiers and voltage amplifiers
In addition to the main differences, there are other differences between power amplifiers and voltage amplifiers:
1. The voltage amplifier collector current is very low and can reach 1mA, but the power amplifier collector current is very high and can be greater than 100mA;
2. Voltage amplifiers can be used for small signal voltages, while power amplifiers are commonly used for higher voltage signals;
3. A voltage amplifier is used to amplify extremely low voltage signals in a circuit, while a power amplifier is used to drive the speaker.
A voltage amplifier can increase the voltage level of a signal, while a power amplifier can increase the power of the signal. This is an important difference between a power amplifier and a voltage amplifier. The output impedance of a voltage amplifier is relatively high, so it is not possible to connect a low impedance load to it because it cannot deliver high load current. In addition, the output impedance of the power amplifier is relatively low, which can provide relatively high current.
The tasks to be completed by voltage amplification circuits and power amplification circuits are also different. The main requirement of voltage amplification circuits is to obtain a voltage signal without distortion for the load. The main indicators are voltage gain, input and output impedance, etc. The output power does not necessarily have to be large. The main requirement of a power amplifier circuit is to obtain a certain amount of undistorted or less distorted output power, usually operating in a large signal state. Therefore, the power amplifier circuit will contain special problems that have not occurred in the voltage amplifier circuit.
Antai ATA-2081 Voltage Amplifier:
ATA-2081 Voltage Amplifier Index Parameters
Figure: ATA-2081 Voltage Amplifier Index Parameters
The similarities between power amplifier and voltage amplifier:
In many cases, power amplifiers and voltage amplifiers only emphasize different output quantities. Voltage amplifiers mainly emphasize voltage, while power amplifiers mainly emphasize power. Without distortion, the output voltage and power are output through the amplifier. Amplification circuits are generally used to enhance voltage amplitude or power amplitude, so different electronic engineers have different names. No matter what kind of circuit the power amplifier is amplifying, the load will have voltage, current, and power simultaneously.
The above is the difference between voltage amplifiers and power amplifiers. If you have any other questions about power amplifiers or voltage amplifiers, please feel free to consult Aetna Electronics.

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