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Class-C amplifier is the one biased so that the output current is zero for more than one half of an input sinusoidal signal cycle. Figure 2.5 illustrates the operation of the class-C
Lecture 22: Class C Power Amplifiers. We discovered in Lecture 18 (Section 9.2) that the maximum efficiency of Class A amplifiers is 25% with a resistive load and 50% with a transformer-coupled resistive load. Also, Class A amplifiers dissipate energy (in the transistor) even when there is no RF output signal! (Why?)
Radio frequency amplifiers used in transmitters can be required to produce thousands of kilowatts of output power, and DC amplifiers used in electronic control systems may also need high power outputs to drive motors or actuators of many different types.
9 Ιαν 2014 · Class C power amplifier circuit diagram, theory, output characteristics, DC load line, efficiency, input and output waveforms, advantages and disadvantages.
Class C • Class C amplifiers conduct less than 50% of the input signal and the distortion at the output is high, but high efficiencies (up to 90%) are possible. Some applications (for example, megaphones) can tolerate the distortion. A much more common application for Class C amplifiers is in RF
Power Amplifiers Many applications do not require linear RF amplification and can therefore make use of the greater efficiency and simplicity offered by Class C tuned power amplifiers. Such applications include amplification of C W, FM, and AM (double-sideband, full-carrier) signals. The CW and FM signals have at
Power amplifiers are large-signal amplifiers. This generally means that a much larger portion of the load line is used during signal operation than in a small-signal amplifier. In this chapter, we will cover four classes of power amplifiers: class A, class B, class AB, and class C.
