Amplifier classes | class A,class B,Class AB,Class C

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July 07, 2022 | Admin |

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This page provides comparison between amplifier classes viz.class A,class B,Class AB and Class C.

• In this class-A, amplifier operates in active region at all the times(2*π). • Stage efficiency = PL(max)/ PS x 100 % Where PS is DC input power. •  Load Power = PL = (VL)2 /RL = (VPP)2/8*RL

• In this class-B, current flows for half of the input cycle(π). • Q point is located at cutoff the DC and AC load lines. VCEQ = VCC/2 •  AC load power of class-B push pull amplifier, PL = (VPP)2/8*RL

• In this class-AB, amplifier operates between half and full input cycle(between π to 2*π).

• In this class-C, amplifier operates for less than half of the input cycle(less than π). • It is basically a tuned amplifier. •  AC load power for class-C amplifier is, PL = (VPP)2/8*RL Where, VPP is peak to peak load voltage and RL is load resistance

Following table mention difference between Class-A,Class-B,Class-AB and Class-C with respect to important parameters.

In order to operate transistor (FET) for a certain class, the gate and drain DC voltages have to be biased carefully to the certain operating point which is called as Quiescent point or Q-point.

Class A offers least distortion, while Class C offers maximum distortion of the output signal.

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