Chapter 3Class AB, B, and C RF Power Amplifiers
3.1 Introduction
The Class B radio-frequency (RF) power amplifier [1–10] consists of a transistor and a parallel-resonant circuit. The transistor is operated as a dependent current source. The conduction angle of the drain or collector current in the Class B power amplifier is 
. The parallel-resonant circuit acts as a bandpass (BP) filter and selects only the fundamental component. The efficiency of the Class B power amplifier is higher than that of the Class A power amplifier. The circuit of the Class C power amplifier is the same as that of the Class B amplifier. However, the operating point is such that the conduction angle of the drain current is less than 
. The conduction angle of the drain current in the Class AB power amplifier is between 
and 
. Class B and C power amplifiers are usually used for RF amplification in radio and TV transmitters as well as in mobile phones. In this chapter, we will present Class AB, B, and C RF power amplifiers with their principle of operation, analysis, and design examples.
3.2 Class B RF Power ...
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