Oscillators – Automatic frequency stabilization using a phase or frequency... – Afc with logic elements
Patent
1981-11-30
1984-07-10
Grimm, Siegfried H.
Oscillators
Automatic frequency stabilization using a phase or frequency...
Afc with logic elements
331 8, 331 27, 331DIG2, 328134, 307526, H03D 1300, H03L 718
Patent
active
044595590
ABSTRACT:
An improvement in a phase locked loop comprising a VCO for generating a signal S.sub.VCO of frequency f.sub.VCO, a divider for dividing f.sub.VCO to produce a signal S.sub.N of frequency f.sub.N, a reference signal generator for generating a reference signal S.sub.R of frequency f.sub.R, and with said VCO responsive to a particular value E.sub.c of a variable control signal e.sub.c to cause f.sub.N =f.sub.R for a given value of N, the improvement consisting of a phase/frequency detector for detecting and correcting frequency and phase differences between S.sub.N and S.sub.R to cause f.sub.N =f.sub.R and comprising a three stage left/right shift register responsive to one of signals S.sub.N or S.sub.R to shift binary O's into the first stage thereof in the right direction and responsive to the other of signals S.sub.N or S.sub.R to shift binary 1's into the third stage thereof in the left direction. Also provided is a bit detector responsive to the 1's and 0's in the center stage of the shift register to produce a control signal e.sub.c either above or below E.sub.c when f.sub.N is greater or less than f.sub.R. The VCO is responsive to the control signal e.sub.c to change the frequency f.sub.VCO of its output signal S.sub.VCO so that f.sub.N =f.sub.R and e.sub.c =E.sub.c.
REFERENCES:
patent: 3714463 (1973-01-01), Laune
patent: 3813604 (1974-05-01), Denoncourt
patent: 3857103 (1974-12-01), Grazia
patent: 3866133 (1975-02-01), Debloois
patent: 3902128 (1975-08-01), Perszyk
patent: 3971994 (1976-07-01), Shepherd
patent: 4020422 (1977-04-01), Underill
patent: 4128811 (1978-12-01), Englund
patent: 4151473 (1979-04-01), Coleman
patent: 4237423 (1980-12-01), Rhodes
patent: 4277754 (1981-07-01), Minakuchi
patent: 4278903 (1981-07-01), Ichinose
Breikss, Ivar, "Shift Register Simplifies Design of Phase Comparator", Electronics, Jan. 19, 1970, p. 93.
Grimm Siegfried H.
Mis David C.
Phillion D. W.
RCA Corporation
Tripoli J. S.
LandOfFree
Phase frequency detector using shift register 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 frequency detector using shift register, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Phase frequency detector using shift register will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1578666