SPICE simulation of a Load Cancellation Circuit

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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.

  • : Free
  • : Intermediate
  • : 11-20
  • : Tina
  • : 7+
  • : Yes


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