Digital phase detector arrangements

Details Digital phase detector arrangements Digital phase detector arrangements

1991-03-25

1993-05-25

Kuntz, Curtis

Pulse or digital communications

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3647241, 328127, H04L 702

Patent

active

052146766

ABSTRACT:
In a digital phase detector arrangement, the combination of a digital phase detector for deriving a digital output signal representing the phase differences between two input clock signals supplied to the phase detector, and a circuit for reducing jitter in the output signal; the circuit comprising a differentiator for differentiating the output signal to produce a differentiated signal, a low-pass filter for low-pass filtering the differentiated signal to produce a filtered signal, and an integrator for integrating the filter signal to produce a further digital output signal from which at least some jitter has been removed by the low-pass filter.

REFERENCES:
patent: 3209261 (1965-09-01), Gritchlow
patent: 4692931 (1987-09-01), Ohsawa
patent: 4893341 (1990-01-01), Gehring
Patent Abstracts of Japan, vol. 13, No. 453 (E-831) Oct. 11, 1989 & JP-A-1 175 310 (Sony) Jul. 11, 1989.
Patent Abstracts of Japan, vol. 13, No. 81 (E-719) Feb. 23, 1989 & JP-A-63 261 912 (Hitachi) Oct. 28, 1988.

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