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Current to frequency converter

  • US 4,498,020 A
  • Filed: 10/19/1981
  • Issued: 02/05/1985
  • Est. Priority Date: 10/19/1981
  • Status: Expired due to Term
First Claim
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1. A current to frequency converter having an input terminal with an input current applied thereto, comprising:

  • (a) a first means having first and second inputs and an output, with said first input connected to said input terminal and with said second input connected to a constant voltage level and a feedback capacitor connected between said first input and said output for producing an output voltage level having a rate of change from a first to a second predetermined voltage level proportional to the magnitude of said input current;

    (b) a second means for selectively connecting said input terminal to said constant voltage level in response to an output signal;

    (c) a third means for selectively altering the energy on said feedback capacitor to change the said output voltage level at said output from said second predetermined voltage level to said first predetermined voltage level in response to said output signal; and

    (d) a fourth means connected to said output to provide said output signal when said output voltage level is at said second predetermined voltage level until said output voltage level is at said first predetermined voltage level for producing a plurality of output signals at a frequency proportional to the magnitude of said input current.

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