×

Injection lock clock detection apparatus

  • US 4,864,574 A
  • Filed: 02/04/1988
  • Issued: 09/05/1989
  • Est. Priority Date: 02/04/1988
  • Status: Expired due to Fees
First Claim
Patent Images

1. Apparatus for detecting failure or malfunction of a master clock signal comprising, in combination:

  • a free-running local oscillator having an unforced oscillation frequency substantially equal to the oscillation frequency of the master clock signal, said local oscillator including means responsive to the master clock signal for producing a lock clock signal synchronized with a logical transition of the master clock signal; and

    ,a detector circuit including means responsive to the master clock signal and the lock clock signal, respectively, for producing a logical comparison of clock cycle waveforms derived from logical transitions of the master clock signal.

View all claims
  • 2 Assignments
Timeline View
Assignment View
    ×
    ×