Phase-locked loop signal generation system with control maintena

Details Phase-locked loop signal generation system with control maintena Phase-locked loop signal generation system with control maintena

1990-08-30

1991-07-02

Grimm, Siegfried H.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Afc with logic elements

331 14, 331 17, 331 25, 331DIG2, 375120, 455 76, 455119, 455260, H03L 7085, H04B 138

Patent

active

050288857

ABSTRACT:
A phase-locked loop system having as input a stable refernce clock signal and outputting a master clock signal. The phase of the stable reference clock signal is compared to that of the pre-scaled master clock signal and the difference represented by an analog error signal which is converted to a digital signal by an A/D converter (116). The digital signal is then transformed into an analog control signal by a D/A converter (120) and applied to a VCO (128) which generates the master clock signal, If the stable reference clock signal has degraded or is lost the A/D converter (116), which receives its sampling clock in part from the stable reference clock signal, stops sampling and thus stops producing digital signals. The last good digital signal is maintained, the last good analog control signal is maintained and thus the master clock signal is maintained.

REFERENCES:
patent: 4107623 (1978-08-01), Graf et al.
patent: 4135166 (1979-01-01), Marchetti
patent: 4494079 (1985-01-01), Light, Jr. et al.
patent: 4673892 (1987-06-01), Miyashita et al.

Affiliated with

Also associated with

Rating

Phase-locked loop signal generation system with control maintena 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 signal generation system with control maintena, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Phase-locked loop signal generation system with control maintena will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1249842