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Apparatus for the generation of monostable pulses having predetermined durations independent of input signal period

  • US 4,276,860 A
  • Filed: 11/01/1979
  • Issued: 07/07/1981
  • Est. Priority Date: 11/01/1979
  • Status: Expired due to Term
First Claim
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1. An apparatus for generating selectable duration periodic pulses comprising:

  • sensor means producing periodic sensor signals having a variable period;

    bi-stable flip-flop means, coupled to said input sensor means, said flip-flop means capable of producing a first and second logic state signals and producing said first logic state signal in response to each periodic sensor signal;

    dual slope rate means, coupled to said bi-stable flip-flop means, producing a time varying signal at a first predetermined rate in one direction in response to said first logic state signal and at a second predetermined rate in the opposite direction in response to said second logic state signal;

    reference source means providing a first predetermined reference voltage level;

    comparator means, coupled to said dual slope rate means and said reference source means, comparing the magnitude of said time varying signal to said first predetermined reference voltage level and producing an output pulse when the magnitude of said time varying signal equals said first reference voltage level;

    means for coupling said output pulse to said bi-stable means, said bi-stable means producing said second logic state signal in response to the initiation of said output pulse and maintaining said second logic state signal until a subsequent sensor signal is received, whereby said first and second logic state signals have durations equal to a predetermined percentages of the variable period of said periodic sensor signals; and

    hysteresis means, responsive to said comparator means and coupled to said reference source means, for adjusting the magnitude of the reference voltage level to a second predetermined voltage level, whereby the duration of the output pulses produced by said comparator is selectable and independent of the period of the sensor signal.

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