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).
A. 1090.9
B. 9821.43
C. 9166.66
D. 10000
Answer:A
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).
A. 1090.9 B. 9821.43 C. 9166.66 D. 10000
Explanation: The closed loop voltage gain , AF = {[A*(R4+R5)]/[(RF+R1+(A*R1)]} = [105*(10kΩ+1kΩ)]/[1kΩ+10kΩ+(105*1kΩ)] =11×108/112000