Why the feedback circuit is said to be negative for voltage series feedback amplifier?
A. Feedback voltage is 180o out of phase with respect to input voltage.
B. Input voltage is 180o out of phase with respect to feedback voltage.
C. Feedback voltage is in same phase with respect to input voltage.
D. Input voltage is in same phase with respect to feedback voltage.
Answer:A
Why the feedback circuit is said to be negative for voltage series feedback amplifier?
A. Feedback voltage is 180o out of phase with respect to input voltage. B. Input voltage is 180o out of phase with respect to feedback voltage. C. Feedback voltage is in same phase with respect to input voltage. D. Input voltage is in same phase with respect to feedback voltage.
Explanation: Voltage series feedback amplifier have the difference voltage, Vid = Vin-Vf. Therefore, the feedback voltage always opposes the input voltage and is out of phase by 180o with respect to input voltage. Hence, the feedback is said to be negative. 5. Determine the closed loop voltage gain from the given circuit. (Where gain of op-amp= 105).