Apparatus and method to reduce jitter in a phase locked loop

Details Apparatus and method to reduce jitter in a phase locked loop Apparatus and method to reduce jitter in a phase locked loop

2006-11-13

2010-02-09

Chang, Joseph (Department: 2817)

Oscillators

Automatic frequency stabilization using a phase or frequency...

Tuning compensation

C331S017000

Reexamination Certificate

active

07659782

ABSTRACT:
A circuit and method to reduce jitter and/or noise in a phase-locked loop (PLL). A voltage-controlled oscillator (VCO) control signal is tapped and filtered to create a low-noise, filtered VCO control signal. The filtered and unfiltered control signals are individually weighted and then combined to create a modified VCO control signal which reduces the jitter and/or the noise by reducing an effect of VCO gain on the jitter and/or the noise.

REFERENCES:
patent: 2005/0062550 (2005-03-01), Melanson
patent: 2007/0030078 (2007-02-01), Wilson

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