Phase locked loop having a filter with controlled variable bandw

Details Phase locked loop having a filter with controlled variable bandw Phase locked loop having a filter with controlled variable bandw

1987-05-26

1988-09-13

Grimm, Siegfried H.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Particular error voltage control

331 1A, 331 8, 331 27, H03L 710, H03L 718

Patent

active

047712490

ABSTRACT:
A phase locked loop (PLL) is provided having a filter with a programmable wide and narrow bandwith. When PLL circuit operation is initiated or when the operational frequency of the PLL is changed by a substantial amount, a phase detector functions to force the filter in a wide bandwith mode to allow fast circuit operation in the transient mode. After the PLL output has settled close to a predetermined frequency, the number of times the output frequency varies above and below the predetermined frequency before reaching a locked state is detected and counted. After the output frequency has varied above and below the predetermined frequency a predetermined number of times, the filter is automatically switched to a low bandwith mode to allow the PLL to operate in a stable manner.

REFERENCES:
patent: 4156855 (1979-05-01), Crowley
patent: 4506233 (1985-03-01), Englund, Jr.

Affiliated with

Also associated with

Rating

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

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-808393