Draw the circuit of complementary, symmetry push pull amplifier and explain its working.

Draw the circuit of complementary, symmetry push pull amplifier and explain its working.
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1 Answer

Answer :

COMPLEMENTRY SYMMETRY CLASS B PUSH PULL AMPLIFIER 

Circuit Diagram: 

image

Circuit description:

* Two transistors one NPN & other PNP is used in the circuit so they are complementary to each other.

* Biasing conditions used for both transistors are same so they are symmetrical.

* R1, R2, VCC are used for voltage divider bias of transistors.

* Both transistors conduct for 180°as it is class B amplifier.

* Whenever one transistor is ON other push to be OFF so the name push pull.


Working:

* Input signal Vin is applied to both the transistor through input capacitor.

* During positive half cycle of input:

  •  The base of the transistors NPN & PNP is positive.
  •  As a result of this NPN conducts & PNP remains OFF.
  •  So we get half cycle in the output.

* During negative half cycle of input:

  •  The base of the transistors NPN & PNP is negative.
  •  As a result of this PNP conducts & NPN remains OFF.
  •  So we get remaining half cycle in the output.

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