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Hi there, For class A amplifier BJT , it is said that the amplifier conduct the...

Hi there, For class A amplifier BJT , it is said that the amplifier conduct the whole cycle and it even amplify when there is no AC input signal , means when we do not have any AC input we have current at the output. so my question is , Is this current the DC collector current which we have when we get the transistor biased in Q point. ?

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Answer #1

Class A amplifier is biased with DC voltage applied at the drain terminal, in this mode collector voltage is kept half of the applied input AC signal, this means that transistor is permanently passing collector current at the output terminal, even if there is no input signal applied. This increases heat therefore heat sink is used in this mode.

Therefore your assumption is correct, that DC current flow due to DC biasing.

Note- please find me in comment box if you find any difficulty.

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