Control method and apparatus for suppressing jitter

Details Control method and apparatus for suppressing jitter Control method and apparatus for suppressing jitter

1994-10-11

1998-04-07

Tse, Young T.

Pulse or digital communications

Synchronizers

Phase displacement, slip or jitter correction

375371, 370516, 370517, H03L 700, H04L 2900

Patent

active

057373736

ABSTRACT:
Provision is made of a phase-locked loop circuit including a voltage-controlled oscillator, a phase comparator, and a low-pass filter, a pulse-cancelling processing unit, a pulse-cancelling control unit, and a divider circuit. By dividing the pulse-cancelling request signal of the pointer-action into several bits by the divider circuit, the pulse-cancelling control unit gradually changes the input phase to the phase comparator or the control voltage to the voltage-controlled oscillator in several stages from the state before the 1-bit pulse-cancelling to the state of the 1-bit pulse-cancelling so that the phase of the output clock signal from the voltage-controlled oscillator matches the 1-bit pulse-cancelled input clock signal. By this, phase control of the output clock signal is performed in units of less than 1-bit and jitter is suppressed.

REFERENCES:
patent: 4599579 (1986-07-01), McCann
patent: 4746870 (1988-05-01), Underhill
patent: 4996698 (1991-02-01), Nelson
patent: 5268936 (1993-12-01), Bernardy
patent: 5285483 (1994-02-01), Ogawa et al.
patent: 5337334 (1994-08-01), Molloy
patent: 5402452 (1995-03-01), Powell et al.
patent: 5426672 (1995-06-01), Volejnik
patent: 5497126 (1996-03-01), Kosiec et al.
T1X1.3/93-006R1, ANS Draft T1.XXX-199X, Draft American National Standard for Telecommunications, Synchronous Optical Network (Sonet): Jitter at Network Interfaces.

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