Noise reduction for phase locked loop

Details Noise reduction for phase locked loop Noise reduction for phase locked loop

2005-05-17

2005-05-17

Le, Dinh T. (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Synchronizing

C327S156000

Reexamination Certificate

active

06894546

ABSTRACT:
A dual signal path provides enhanced noise cancellation for phase locked loop applications. According to various aspects of the invention, dual charge pumps are used to split the phase locked loop signal into dual signal paths, wherein each path carries an information signal with an injected noise component. The dual signal paths are arranged to maintain the magnitude and phase characteristics of the injected noise component. Filter blocks process the signals, retaining the injected noise component. The filtered signals are coupled to the input of an adder circuit where the filtered signals are subtracted. Because each filtered signal contains the injected noise component, the subtraction operation effectively cancels the injected noise component from the filtered signals.

REFERENCES:
patent: 5121085 (1992-06-01), Brown
patent: 5382923 (1995-01-01), Shimada et al.
patent: 5631587 (1997-05-01), Co et al.
patent: 5767714 (1998-06-01), Kotani et al.
patent: 5821789 (1998-10-01), Lee
patent: 6320435 (2001-11-01), Tanimoto

Affiliated with

Also associated with

Rating

Noise reduction for phase locked loop does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Noise reduction for phase locked loop, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Noise reduction for phase locked loop will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-3422440