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Get to know RF power amplifiers

2025-09-05

The operating frequency of RF power amplifiers is very high, but the frequency band is relatively narrow. RF power amplifiers generally use a frequency selection network as the negative cutting circuit. RF power amplifiers can be classified into three working states: A, B , and C according to the different conduction angles of the current. The conduction angle of Class A amplifier current is 360 degrees, suitable for small signal low-power amplification. The conduction angle of Class B amplifier current is equal to 180 degrees, while the conduction angle of Class C amplifier current is less than 180 degrees. Both Class B and Class C are suitable for high-power working conditions, with Class C having the highest output power and efficiency among the three working conditions. Most RF power amplifiers work in Class C, but the current waveform distortion of Class C amplifiers is too large and can only be used for load resonance power amplification using tuned circuits. Due to the filtering capability of the tuning circuit, the current and voltage of the circuit still approach a sinusoidal waveform with minimal distortion.

Zhongshi Zhihui Technology (suzhou) Co., Ltd.

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Get to know RF power amplifiers

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