Question

Why the feedback circuit is said to be negative for voltage series feedback amplifier?

• A. Input voltage is 180° out of phase with respect to feedback voltage
• B. Feedback voltage is 180° out of phase with respect to input voltage
• C. Input voltage is in same phase with respect to feedback voltage
• D. Feedback voltage is in same phase with respect to input voltage

Hint:

Remember that negative feedback implies that the feedback signal is 180° out of phase with the input signal. This is a key concept in amplifier design.

Answer 1

The Correct Option is B

In a voltage series feedback amplifier, the feedback signal is connected in series with the input signal and is out of phase with the input signal by 180°. This out-of-phase relationship causes negative feedback. Negative feedback is used in amplifiers to achieve a controlled gain, higher linearity and stability.