Pulse or digital communications – Synchronizers – Phase displacement – slip or jitter correction
Patent
1995-07-14
1997-04-01
Chin, Stephen
Pulse or digital communications
Synchronizers
Phase displacement, slip or jitter correction
331 18, 331 25, 331 57, H03D 324
Patent
active
056174543
ABSTRACT:
The invention relates to a transmission system comprising a phase-locked loop (12) which includes a phase comparator (15) for comparing an oscillator signal with a reference signal and for generating a comparison signal, and an oscillator which is provided for receiving a control signal derived from the comparison signal. The oscillator arranged as a ring oscillator (14) comprises at least one delay element (27 to 31) included in a closed circuit. At least one delay element (27 to 30) has at least two different adjustable delay times. A controller (19) is provided for setting the delay times of at least one delay element (27 to 30) in dependence on the comparison signal.
REFERENCES:
patent: 5068628 (1991-11-01), Ghoshal
patent: 5136260 (1992-08-01), Youselfi-Elezei
patent: 5399995 (1995-03-01), Kardontchik et al.
patent: 5459766 (1995-10-01), Huizer et al.
Brachmann Markus
Eckart Thomas
Frank Georg
Gotz Hans-Joachim
Chin Stephen
Nguyen Thuy L.
Schmitt Michael E.
U.S. Philips Corporation
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