Harmonic lock detector

Details Harmonic lock detector Harmonic lock detector

1992-11-30

1994-08-09

Pascal, Robert J.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Afc with logic elements

331 64, 331DIG2, 331 17, H03L 700

Patent

active

053370228

ABSTRACT:
An integrated circuit for detecting harmonic lock of a phase-locked loop includes a frequency synthesizer for receiving a reference clock signal and for generating an oscillator clock signal. A phase generator receives the oscillator clock signal and generates a phase of the oscillator clock signal. A shift register receives as an input the reference clock signal and is clocked by the phase of the oscillator clock signal to produce an output that is a repetitive sequence of logic states. In an alternate embodiment, a harmonic decode circuit decodes the shift register output to determine which harmonic the phase-locked loop has locked onto.

REFERENCES:
patent: 3988696 (1976-10-01), Sharpe
patent: 4077016 (1977-02-01), Sanders et al.
patent: 4115745 (1978-09-01), Egan
patent: 4151463 (1979-04-01), Kibler
patent: 4590440 (1984-07-01), Hague et al.
"PLL's Lock Indicator detects Latching Simply" by S. Kirby Electronics Apr. 10, 1980 pp. 127-129.
"How can you be sure that your PLL is really locked in?" by A. Sharpe EDN Feb. 20, 1977 vol. 22, #4. p. 109.

Affiliated with

Also associated with

Rating

Harmonic lock detector does not yet have a rating. At this time, there are no reviews or comments for this patent.

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

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-218617