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Question

# The amplifier A shown in the figure has open loop gain of 100, input impedance Zi of 1 kΩ and output impedance Z0 of 100 Ω. If a negative feedback factor β=0.99 is used, the new values of Zi and Z0 respectively are

A
10 Ω and 10 Ω
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B
100K Ω and 1 Ω
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C
10 Ω and 1 Ω
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D
100 Ω and 10 Ω
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Solution

## The correct option is B 100K Ω and 1 Ω Open loop gain , A = 100 Feedback factor, β=0.99 Input impedance Zi=1kΩ Z′i=Zi(1+Aβ) =103(1+100×0.99)=100 kΩ Output impedance after negative feedback =Z01+Aβ=1001+100×0.99=1Ω

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