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The feedback topology in the amplifier circuit (the base bias circuit is not shown for simplicity) in the figure is

The feedback topology in the amplifier circuit (the base bias circuit is not shown for simplicity) in the figure is Correct Answer Current series feedback

In a current series feedback, current is sampled from the output and voltage is feedback to the source.

In the given amplifier circuit, the feedback signal becomes zero by opening the output feedback.

Hence, it is a current series feedback.

Important Points

Procedure to find the type of feedback

Step - 1: Draw AC Model of circuit capacitor-short circuited DC supply-connect to ground.

Step-2: Identify the feed back element in circuit in above circuit RE is feedback element.

Step-3: If f/b element is already connected to output then it indicate voltage sampling otherwise current sampling. RE directly not connected to output so current sampling.

Step-4: If f/b element is directly connect to input these it indicate shunt mixing otherwise series mixing. Since RE is directly not connected to input so series mixing.

Answer - current-series feedback.

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