Ham Radio General Class Practice Test

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Which of these classes of amplifiers has the highest efficiency?

Class A
Class B
Class AB
Class C

The correct answer is: Class C

Class C amplifiers are designed specifically for applications where high efficiency is essential, such as in radio transmission. This type of amplifier conducts for less than half of the input signal cycle, typically around 180 degrees or less. Because of this brief conduction period, Class C amplifiers can achieve efficiencies exceeding 80% or even higher, making them particularly well-suited for high-frequency operation. The operation of Class C amplifiers effectively reduces power loss during the non-conducting phase of the signal cycle. This characteristic allows them to maximize output power while minimizing wasted energy in comparison to other amplifier classes, which have prolonged conduction periods leading to higher heat generation and lower efficiency. Thus, in the context of power amplifiers used in RF applications, Class C is recognized for its superior efficiency.