The output impedance of a voltage series feedback is 10 Ω, If the gain of the basic amplifier is 100 and feedback fraction is 0.01, what is the output impedance without feedback?

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KVS TGT WET (Work Experience Teacher) 23 Dec 2018 Official Paper
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  1. 20 Ω
  2. 30 Ω
  3. 35 Ω
  4. 25 Ω

Answer (Detailed Solution Below)

Option 1 : 20 Ω
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Detailed Solution

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Concept:

Voltage Series Feedback Amplifier:

In this type of circuit, a portion of the o/p voltage can be applied to the input voltage in series through the feedback circuit.

F4 Vinanti Engineering 21.12.22 D9

It is apparent that the feedback circuit is located in shunt by means of the output although in series by means of the input.

When the feedback circuit is allied in shunt through the output, then

  • The o/p impedance will be reduced by (1+Aβ).
  • The i/p impedance is enlarged by (1+Aβ )because of the series connection with the input.

Calculation:

Given;

Gain(A) = 100

Feedback factor(β) = 0.01

Output impedance = 10 Ω 

Let;

Output impedance without feedback R0 .

Then;

    R0/(1+Aβ) = 10

⇒ R0 = 10(1+Aβ ) = 10(1+ 100× 0.01) = 10×2

R= 20 Ω 

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