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Module - 2 AE QB

Negative feedback in amplifiers involves feeding a portion of the output signal back to the input to oppose the input signal, which reduces gain but enhances stability and bandwidth. It improves amplifier performance by reducing distortion, noise levels, and output impedance while increasing input impedance and bandwidth. There are four basic feedback configurations: voltage series, voltage shunt, current series, and current shunt, each affecting the amplifier's characteristics differently.

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13 views2 pages

Module - 2 AE QB

Negative feedback in amplifiers involves feeding a portion of the output signal back to the input to oppose the input signal, which reduces gain but enhances stability and bandwidth. It improves amplifier performance by reducing distortion, noise levels, and output impedance while increasing input impedance and bandwidth. There are four basic feedback configurations: voltage series, voltage shunt, current series, and current shunt, each affecting the amplifier's characteristics differently.

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amurihemavardhan
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© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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MODULE 2 : NEGATIVE FEEDBACK AMPLIFIERS

1: What is negative feedback in an amplifier?


A: Negative feedback is the process of feeding a portion of the output signal back to the input in such
a way that it opposes the input signal, reducing gain but improving stability and bandwidth.

2: How does negative feedback affect the bandwidth of an amplifier?


A: Negative feedback increases the bandwidth by reducing the gain, which allows the amplifier to
operate over a wider range of frequencies.

3: What are the four basic types of feedback configurations in amplifiers?


A: The four types are voltage series, voltage shunt, current series, and current shunt feedback.

4: What is voltage series feedback?


A: Voltage series feedback is a feedback configuration where the output voltage is sampled and fed
back in series with the input signal.

5: What effect does negative feedback have on distortion in amplifiers?


A: Negative feedback reduces distortion by linearizing the amplifier's operation and minimizing non-
linear behavior.

6: Define feedback factor (β) in an amplifier.


A: The feedback factor (β) is the fraction of the output signal that is fed back to the input in a
feedback amplifier.

7: How does negative feedback affect the gain of an amplifier?


A: Negative feedback reduces the overall gain of the amplifier, making it more stable and less
sensitive to component variations.

8: What is the purpose of current series feedback?


A: Current series feedback improves the input impedance and provides better stability and linearity in
current-controlled amplifiers.

9: What is meant by voltage shunt feedback?


A: Voltage shunt feedback is when the output voltage is sampled and fed back to the input in parallel
(shunt) with the input signal.

10: How does negative feedback improve the stability of an amplifier?


A: Negative feedback improves stability by reducing the amplifier’s sensitivity to variations in
component values and external disturbances.

11: What is the effect of negative feedback on input impedance in a voltage series feedback
amplifier?
A: Negative feedback increases the input impedance in a voltage series feedback amplifier.

12: Define current shunt feedback.


A: In current shunt feedback, the output current is sampled and fed back in parallel (shunt) with the
input signal to reduce the gain.

13: What is the impact of negative feedback on the noise level of an amplifier?
A: Negative feedback reduces the noise level by lowering the gain and averaging out noise
disturbances across the feedback loop.

14: What is feedback amplifier stability?


A: Stability refers to the ability of a feedback amplifier to avoid oscillations and maintain consistent
performance under varying conditions.

15: How does negative feedback affect the output impedance of an amplifier?
A: Negative feedback reduces the output impedance of an amplifier, making it more suitable for
driving loads with varying resistance.

16: What are the general characteristics of negative feedback amplifiers?


A: Negative feedback amplifiers have reduced gain, increased bandwidth, improved linearity, reduced
distortion, and enhanced stability.

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