Phase locked loop with optimally controlled bandwidth

Details Phase locked loop with optimally controlled bandwidth Phase locked loop with optimally controlled bandwidth

1988-12-19

1990-04-24

Miller, Stanley D.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

328167, 307262, 307521, 331 1A, 331 17, 331 25, H03K 1700, H03L 700

Patent

active

049203207

ABSTRACT:
A phase locked loop has a digital phase comparator, a filter with multiple bandwidths, a voltage controlled oscillator and a frequency divider connected to the phase comparator to complete the loop. Control circuitry is coupled to both the phase comparator and filter for controlling switching between a wide bandwidth and a narrow bandwidth. The switching in bandwidth is in response to either detecting when the output signal is within a predetermined range of the reference frequency for a predetermined time period or detecting when the output signal exceeds and falls below the reference frequency a predetermined number of times. The control circuit is implemented with circuitry which accurately detects either condition and is capable of blocking any premature change of bandwidth.

REFERENCES:
patent: 3729688 (1973-04-01), Cerny et al.
patent: 4135165 (1979-01-01), Coe
patent: 4330758 (1982-05-01), Swisher et al.
patent: 4482869 (1984-11-01), Hirata
patent: 4500857 (1985-02-01), Bosselaers et al.
patent: 4516083 (1985-05-01), Turney
patent: 4745371 (1988-05-01), Haine
patent: 4774480 (1988-09-01), Sato et al.
patent: 4816770 (1989-03-01), Naumann
patent: 4829268 (1989-05-01), Leuthold et al.

Affiliated with

Also associated with

Rating

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

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-36134