The closed- loop input impedance in a noninverting amplifier is
A)ideally zero.
B)sometimes less than the open- loop input impedance.
C)equal to the open- loop input impedance.
D)much greater than the open- loop input impedance.

Question

Quizplus · Accepted Answer

The closed-loop input impedance in a noninverting amplifier is much greater than the open-loop input impedance because the feedback network increases the effective input impedance seen by the source.

The Closed- Loop Input Impedance in a Noninverting Amplifier Is