Types of Amplifiers (I)⎯Based on Operation Point Class-A Amplifier: In this operation mode, each transistor in the amplifier operates in the active region of the entire signal circle. Class-B Amplifier: In this operation mode, each transistor is in the active region of approximate half the signal cycle. Class-AB Amplifier: In this operation mode, an amplifier operates in class A for small signals and in class B for large signals. Class-C Amplifier: In this operation mode, each transistor of the amplifier is in the active region for significantly less than half of the signal cycle. The active region of a transistor is shown in Figure 1. The transfer characteristics of a transistor are illustrated in Figure 2. 3
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