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Transistor: Working

For obtaining...

Question

For obtaining very high input and output impedance in a feedback amplifier, the most frequently used configuration is

A

voltage shunt

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B

Voltage series

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C

current series

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D

current shunt

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Solution

The correct option is C current series
Current series feedback amplifier has very high input and very high output impedance.
It is also called as series fed amplifier or transconductance amplifier.
The input resistance becomes $R_{i} (1 + A β)$ , while output resistance becomes $R_{0} (1 + A β)$ .

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