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For the voltage series feedback amplifier shown in figure below which of the statements option given is TRUE? 

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  1. Input impedance decreases and output impedance increases
  2. Input impedance decreases and output impedance also decreases
  3. Input impedance increases and output impedance also increases
  4. Input impedance increases and output impedance decreases

Answer (Detailed Solution Below)

Option 4 : Input impedance increases and output impedance decreases
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Detailed Solution

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Concept:

The comparison of different feedback configurations is as follows:

Parameter

Voltage - Series

Current - Series

Current - Shunt

Voltage-Shunt

Input Resistance

Increases

Increases

Decreases

Decreases

Output Resistance

Decreases

Increases

Increases

Decreases

 

From here we may conclude that input impedance increases while output impedance decreases in voltage series feedback amplifier

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