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DEVICE FOR COUNTING OSCILLATIONS OF AN OSCILLATING TEMPORAL SIGNAL

  • US 20090309574A1
  • Filed: 06/15/2009
  • Published: 12/17/2009
  • Est. Priority Date: 06/16/2008
  • Status: Active Grant
First Claim
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1. A device for counting oscillations of an oscillating time signal, which comprises:

  • a first comparator which receives said time signal and which compares it to a first threshold value which is positive;

    a first AND logic gate, a first input of which is linked to the output of said first comparator;

    a first two-input bistable flip-flop, a signal input of which is linked to the output of said first AND logic gate;

    a first inverter which is mounted between the output of said first bistable flip-flop and the second input of said first AND logic gate;

    a second comparator which also receives said time signal and which compares it to a second threshold value which is negative, the output of said second comparator being linked to an initialization input of said first bistable flip-flop;

    a second AND logic gate, a first input of which is linked to the output of said second comparator;

    a second two-input bistable flip-flop, a signal input of which is linked to the output of said second AND logic gate, and an initialization input of which is linked to the output of said first comparator;

    a second inverter which is mounted between the output of said second bistable flip-flop and the second input of said second AND logic gate;

    an OR logic gate, the two inputs of which are linked respectively to the outputs of said first and second AND logic gates, and the output of which controls a switching means to generate a unit value intended to increment a counter, each time said time signal exceeds, alternatively, one of said first and second threshold values; and

    said counter which is thus incremented and which handles the counting of the oscillations of said oscillating time signal.

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