what is the value of Rin? (different problem)

Asked Jan 26 '21 at 17:51

Active Jan 27 '21 at 06:14

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I calculated voltage at Vx. How to know the input impedance? V- is at virtual gnd. Will it be Ra+(Rb||R1). My question of input impedance seeing from node Vs is right or should we consider only from node Vx. I’m trying to intuitively understand opamps.

edited Jan 27 '21 at 06:14

asked Jan 26 '21 at 17:51

negative_feedback

1

This is different question than previous one – negative_feedback Jan 26 '21 at 19:03
1

Well, I would say that Rin = Ra+(Rb||R1) if we are dealing with an ideal opamp. – G36 Jan 26 '21 at 19:14

what is the value of Rin? (different problem)

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