Difference between class C and class D amplifier?

i think u r engg ok forgot but three types amp are ther one A ,B,C and D





in CLASS C and CLASS D are special types of amplifier if u want to know more then send me queok

Difference between class C and class D amplifier?
class C:


The output device (transistor or tube) is biased so that it conducts current for only part of the input signal cycle. It is almost always associated with a resonant LC tank. The resonant tank will complete the "cycle" when it gets the 'kick' from the output device turning on. Contrast that to a class A amp: the output device is *always* conducting current -- very wasteful. Class C amps are very efficient compared to class A and B. They are used mainly in RF output circuits.





Class D:


The output is pulse-width modulated (PWM). The output devices are either in saturation, or completely cutoff. The output looks like a (PWM) square-wave with amplitude of the Vcc and Vee voltages peak-to-peak. Passive RLC filtering after the output filters out the high frequency carrier and leaves the modulating signal to the load. In audio applications even the loudspeaker helps to filter out the PWM carrier. Class D is efficient in that the output transistors are either cutoff (zero power dissipation in the transistor) or in saturation (also using very little power). Most of the power is transferred to the load.





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