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Learn about RF power amplifiers

2025-07-10

The operating frequency of RF power amplifiers is very high, but the relative frequency band is narrow. RF power amplifiers generally use frequency selection networks as the load loop. RF power amplifiers can be divided into three types of working states: A (A), B (B), and C (C) according to different current conduction angles. The conduction angle of the current of the Class A amplifier is 360°, which is suitable for small signal and low power amplification. The conduction angle of the current of the Class B amplifier is equal to 180°, and the conduction angle of the current of the Class C amplifier is less than 180°. Both Class B and Class C are suitable for high-power working states, and the output power and efficiency of Class C working state are the highest among the three working states. Most RF power amplifiers work in Class C, but the current waveform of Class C amplifiers is too distorted and can only be used for resonant power amplification using a tuned loop as a load. Because the tuning loop has filtering capabilities, the loop current and voltage are still close to sinusoidal waveforms, with little distortion.

Zhongshi Zhihui Technology (suzhou) Co., Ltd.

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Learn about RF power amplifiers

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