Phase locked loop circuit

Details Phase locked loop circuit Phase locked loop circuit

1987-03-17

1988-09-27

Laroche, Eugene R.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Afc with logic elements

331 8, 331 17, 328133, 307511, H03L 708

Patent

active

047744790

ABSTRACT:
A phase locked loop circuit using a reference signal and a response control signal with a preset transition time, comprising a voltage-controlled oscillator to produce a signal variable in phase, a detecting circuit responsive to the reference and variable-phase signals for producing a signal indicating a delay or advance in phase of the variable-phase signal with respect to the reference signal during a phase difference detect period for which the signal from the detecting circuit is indicative of a difference in phase between the reference and variable-phase signals for each period of cycle of the variable-phase signal, a voltage signal generating circuit responsive to the signal from the detecting circuit for producing a voltage signal having first and second states to advance and retard the phase of the variable-phase signal, respectively, and a third state to maintain the phase of the variable-phase signal, the signal generating circuit being responsive to this voltage signal for producing the variable-phase signal with its phase advanced or retarded in response to the first and second state of the control voltage signal or maintained in response to the third state of the control voltage signal, and a response control circuit responsive to the response control signal for conditioning the signal generating circuit to produce the voltage signal with the third state at a time subsequent to the phase difference detect period.

REFERENCES:
patent: 4316150 (1982-02-01), Crosby

Affiliated with

Also associated with

Rating

Phase locked loop circuit does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Phase locked loop circuit, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Phase locked loop circuit will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2399630