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
  • load current vs input voltage first op amp output current for different Rc compensation values compensation current for different Rc values


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