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A voltage-series negative feedback amplifier has a voltage gain without feedback of A = 500, input resistance R( = 3 kΩ and feedback ratio p = 0.01. The voltage gain Af and input resistance Rtf of the amplifier with feedback are respectively
  • a)
    83.33 and 18 kΩ
  • b)
    55.54 and 22 kD
  • c)
    83.33 and 22 kD
  • d)
    55.54 and 18 kQ
Correct answer is option 'A'. Can you explain this answer?
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A voltage-series negative feedback amplifier has a voltage gain withou...
For a voltage-series negative feedback amplifier, input resistance with negative feedback is 
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A voltage-series negative feedback amplifier has a voltage gain withou...
Ω, and output resistance R( = 1 kΩ. Determine the voltage gain with negative feedback if the feedback resistor Rf is 10 kΩ.

The voltage gain with negative feedback can be calculated using the formula:

A(f) = A / (1 + Aβ)

where A is the voltage gain without feedback, β is the feedback factor (β = Rf / (Rf + R( ) and A(f) is the voltage gain with negative feedback.

Plugging in the given values, we get:

β = Rf / (Rf + R( ) = 10 kΩ / (10 kΩ + 3 kΩ) = 0.7692

A(f) = 500 / (1 + 500 x 0.7692) = 9.09

Therefore, the voltage gain with negative feedback is 9.09.
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A voltage-series negative feedback amplifier has a voltage gain without feedback of A = 500, input resistance R( = 3 kΩ and feedback ratio p = 0.01. The voltage gain Af and input resistance Rtfof the amplifier with feedback are respectivelya)83.33 and 18 kΩb)55.54 and 22 kDc)83.33 and 22 kDd)55.54 and 18 kQCorrect answer is option 'A'. Can you explain this answer?
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