2 Consider the circuit of Fig P242 in which v and v are buff

2) Consider the circuit of Fig P2.42 in which v+ and v- are buffered by an attenuator consisting of RA and

RB. This circuit can be used to determine the open loop gain of the op amp. Find an approximate value for the input resistance seen by the vIN source for the case RA >> R1, R2.

2)for a given assumption the RA is ignored then R1 and R2 are series. The input impedance seen by source is R1+R2