One method generally employed to categorize amplifier is by class which basically represent the mount of output signal varies over one cycle of "operation for a full cycle of input signal.
1.Class A : The amplifier circuits which falls into this category are linear as these operate in a small
region in the middle of the load line.
2. Class B : This amplifier circuit provides an output signal varying over one-half the input signal cycle.
Class ration creates a very distorted output Bee ton of the input takes place for only _ 180° of the output signal swing. Power efficiency ‘of class-B is more than that of Class-A.
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