Ham Amateur Radio Technician Practice Exam

Question: 1 / 470

How is the efficiency of an RF power amplifier determined?

By the input voltage

By the RF output power divided by the DC input power

The efficiency of an RF power amplifier is determined by the ratio of the RF output power to the DC input power. This ratio expresses how effectively the amplifier converts DC power from its power supply into RF output power that can be transmitted.

Efficiency is a critical parameter in amplifier design because it influences the overall performance, heat dissipation, and power consumption of the device. A higher efficiency means that more of the input power is being successfully converted into output power, which is desirable for effective signal transmission and minimal energy loss.

While input voltage, operation frequency, and type of modulation can affect amplifier performance in various ways, they do not directly quantify efficiency in the way that the output power to input power ratio does. Thus, focusing on the proportion of RF output power to DC input power is the definitive method for assessing efficiency in RF amplifiers.

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By the operation frequency

By the type of modulation used

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