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CLASS A AMPLIFIERS
COMMON-EMITTER CONFIGURATION (CE)

Neets Module 07-Introduction to Solid-State Devices and Power Supplies
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2-47 CLASS B AMPLIFIERS are biased so that collector current is cut off during one-half of the input signal. Thus, for a class B operation, collector current will flow for approximately 180 degrees (half) of the input signal. The class B operated amplifier is used as an audio amplifier and sometimes as the driver- and power- amplifier stage of transmitters. CLASS C AMPLIFIERS are biased so that collector current flows for less than one-half cycle of the input signal. The class C operated amplifier is used as a radio-frequency amplifier in transmitters. FIDELITY and EFFICIENCY are two terms used in conjunction with amplifiers. Fidelity is the faithful reproduction of a signal, while efficiency is the ratio of output signal power compared to the total input power. The class A amplifier has the highest degree of fidelity, but the class C amplifier has the highest efficiency. A TRANSISTOR CONFIGURATION is the particular way a transistor is connected in a circuit. A transistor may be connected in any one of three different configurations: common emitter (CE), common base (CB), and common collector (CC).






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