The role of main power amplifier and auxiliary power amplifier in doherty power amplifier
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The role of main power amplifier and auxiliary power amplifier in doherty power amplifier

Posted Date: 2024-01-31

Doherty power amplifier is a special linear power amplifier that uses a combination of main power amplifier and auxiliary power amplifier to achieve efficient and high linearity power amplification.

The core idea of ​​Doherty power amplifier is to design the main power amplifier and auxiliary power amplifier into different working states. The main power amplifier works in Class B or Class AB to achieve higher efficiency; the auxiliary power amplifier works in Class C to achieve higher linearity. When the input signal is small, only the main power amplifier works; when the input signal increases, the auxiliary power amplifier starts to work and amplifies the signal together with the main power amplifier. With proper impedance matching and phase adjustment, Doherty amplifiers are able to maintain high efficiency and linearity over the entire signal range.

The advantages of Doherty power amplifiers include: high efficiency, high linearity, high output power, etc. It is widely used in communications, radar, electronic warfare and other fields, especially in application scenarios with high linearity requirements such as 5G communications and satellite communications.

The design and implementation of Doherty power amplifiers require comprehensive consideration of various factors, such as impedance matching, phase adjustment, working status, etc., to ensure optimal performance. At the same time, testing and verification are also required to ensure its stability and reliability under different working conditions.

The role of main power amplifier and auxiliary power amplifier in doherty power amplifier

Doherty power amplifier is a high-efficiency power amplifier used in wireless communication systems. It consists of a main power amplifier (Main Amplifier) ​​and an auxiliary power amplifier (Peaking Amplifier), which is used to improve the efficiency and linearity of the entire power amplifier. The main power amplifier and auxiliary power amplifier play different roles in the Doherty power amplifier:

1. Main Amplifier:

- The main power amplifier is responsible for providing high amplification gain and high efficiency in the low power input signal range. It is usually responsible for handling a larger portion of the input signal power and provides linear amplification at low power levels.

2. Peaking Amplifier:

- The auxiliary power amplifier mainly functions in the high-power input signal range, providing additional power gain by overlapping the operating state of the main power amplifier. When the input signal power exceeds a certain threshold, the auxiliary power amplifier starts to work, improving the efficiency of the overall power amplifier by increasing the output of the entire power amplifier.

Therefore, the main power amplifier and auxiliary power amplifier in the Doherty power amplifier work together to achieve effective amplification and processing of low-power and high-power input signals, thereby improving the overall efficiency and linearity of the power amplifier, making it ideal for wireless communications Better performance in the system.

Review Editor: Huang Fei


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