Explanation: The characteristics of non-inverting amplifier are identical to differential amplifier with two op-amps as the gain of the amplifier are same. i.e. A = 1+(RF /R1). 2. How is it possible to vary the voltage from closed loop gain to the open loop gain?
A. By using differential amplifier with larger gain
B. By using differential amplifier with small gain
C. By using differential amplifier with variable gain
D. By using differential amplifier with differential gain
Answer:A
Explanation: The characteristics of non-inverting amplifier are identical to differential amplifier with two op-amps as the gain of the amplifier are same. i.e. A = 1+(RF /R1). 2. How is it possible to vary the voltage from closed loop gain to the open loop gain?
A. By using differential amplifier with larger gain B. By using differential amplifier with small gain C. By using differential amplifier with variable gain D. By using differential amplifier with differential gain
Explanation: Variable gain in differential amplifier can be obtained by using a potentiometer. So, depending on the position of the wiper in potentiometer, voltage gain can be varied from the closed loop gain to the open loop gain.