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Amplifier having dead zone of controllable width and position

  • US 4,277,695 A
  • Filed: 07/16/1979
  • Issued: 07/07/1981
  • Est. Priority Date: 07/16/1979
  • Status: Expired due to Term
First Claim
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1. A dead zone amplifier for supplying output current in a given sense to a load when an input signal is above a first level and for supplying output current in the opposite sense to said load when said input signal is below a second level, said levels defining a dead zone within which no output current flows in either sense to said load, said dead zone amplifier comprising:

  • an input circuit responsive to an input signal and a width control signal for providing a first composite output signal representative of the sum thereof, said input circuit being also responsive to said width control signal and a position control signal for providing a second composite output signal representative of the sum thereof;

    a first differential amplifier responsive to said input signal and said second composite output signal for producing a first output current of a given sense when said input signal and said second composite output signal are of first relative magnitudes, said first output current being zero otherwise;

    a second differential amplifier responsive to said position signal and said first composite output signal for producing a second output current of said given sense when said position control signal and said first composite signal are of first relative magnitudes, said second output current being zero otherwise; and

    an output circuit for subtracting one of said output currents from the other to produce a difference current for application to said load, whereby the position and width of said dead zone are independently and non-interactively controllable in response to changes in said position and width control signals.

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