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Digital phase lock circuit

  • US 4,242,639 A
  • Filed: 09/05/1978
  • Issued: 12/30/1980
  • Est. Priority Date: 09/05/1978
  • Status: Expired due to Term
First Claim
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1. A phase lock circuit comprising:

  • means for providing an indication signal upon the occurrence of a predetermined number of transitions in an input signal;

    means for providing a periodic signal;

    first means for dividing the number of periodic signals occurring between successive indication signals by the number of predetermined transitions in the input signal to provide a quotient output signal;

    second means for dividing the predetermined number of periodic signals by said quotient output signal to provide a periodic output signal having a frequency and phase corresponding to said input signal; and

    a holding register means interposed between said first and said second means for holding the quotient output signal from said first means for use by said second means, said holding register means adapted to reset upon receipt of said indication signal.

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