The AD620, along with another op-amp and two resistors, makes a precision current source circuit.
The op-amp buffers the reference terminal to maintain good CMR. The output voltage, VX, of the AD620 appears across R1, which converts it to a current. This current, less only the input bias current of the op amp, then flows out to the load.where
Vx = [(Vin+) – (Vin-)] * G
IL = Vx / R1
Circuit operates on 1.8 mA, ±3 V
Gain(G) is resistor-programmed by Rg
Rg = 49.4K ohm / (G-1)
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