I am trying to implement a current output amplifier circuit shown below. Current is measured across sense resistor Rs to adjust input voltage Vin.
Gain: G = -Iout/Vin = R2/(Gain-of-IA1*R1*RS)
The gain of this circuit is set at 1 with R2 = 1kohm, R1 = 100kohm, RS = 0.01ohm, RL is the load. It has an instrumentation amplifier IA1 on the feedback path for less noise and better resolution. The gain of IA1 is also 1. If I decide to increase resistance of Rs and decrease resistance of R1 while keeping the gain at 1. How would changing sense resistor value affect my system performance?