Class C Power Amplifiers – Circuit Diagram, Operation and Applications: A class C power amplifiers is biased to operate for less than 180° of the input signal cycle, as shown in Fig. 17.22. The tuned circuit in the output, however, will provide a full cycle of output signal for the fundamental or resonant frequency of […]
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Harmonic Distortion in Power Amplifier – Waveform and Derivation: Harmonic Distortion in Power Amplifier – Output signal variations of less than 360° of the signal cycle are considered to have distortion. This means that the output signal is no longer just an amplified version of the input signal but in some way a distorted or
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Class B Power Amplifier – Operation and Efficiency derivation: In Class B Power Amplifier operation, the transistor is so biased that zero signal collector current is zero. Hence class B operation does not need any biasing system. The operating point is set at cutoff, as illustrated in Fig. 17.18. It remains forward biased for only
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Transformer Coupled Class A Power Amplifier: Transformer Coupled Class A Power Amplifier also sometimes referred to as single ended power amplifier. The term “single ended” (denoting only one transistor) is used to distinguish it from the push-pull amplifier using two transistors. In case of a direct coupled class A power amplifier, the quiescent current flows
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Class A Power Amplifiers (Direct Coupled with Resistive Load): A class A power amplifiers is defined as a power amplifier in which output current flows for the entire cycle (360°) of the input signal, as illustrated in Fig. 17.4. In other words, the transistor remains forward biased throughout the input cycle. A schematic circuit of
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Various Stages in a Practical Power Amplifier and Block Diagram: Power amplifier is meant to amplify a weak signal until sufficient power is available to operate an output device such as a loudspeaker, a solenoid or a relay. Power amplifier, to provide the desired power amplification, has generally 3 stages (voltage amplification stage, driver stage
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Classification of Power Amplifiers: Classification of Power Amplifiers are primarily divided into two categories viz. audio power amplifiers and radio power amplifiers. Audio power amplifiers, also called the small signal power amplifiers, raise the power levels of signals that have audio frequency range (20 Hz-20 kHz). Radio power amplifiers, also called large signal or power
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