The second stage of a voltage follower op amp, is a second operational amplifier that implements a load cancellation circuit. The output current of first operational amplifier is a function of its input voltage Vin and its load resistance RL. For example when Vin = 1V, AM1 (U1 output) and AMload (load current) = -1mA. The cancellation circuit provides all or part of this current. With compensation adjusted for 100%, the load current is furnished entirely by the compensation circuit. Thus the output of U1 essentially sees an “open circuit”. Rc controls the degree of load current compensation.