GHz transceiver phase lock loop having autofrequency lock correc

Details GHz transceiver phase lock loop having autofrequency lock correc GHz transceiver phase lock loop having autofrequency lock correc

1997-08-29

1999-09-07

Chin, Wellington

Telecommunications

Transmitter and receiver at same station

375219, 375327, 327147, 327148, H04B 138

Patent

active

059501154

ABSTRACT:
A transceiver circuit used in connection with a fiber channel serial interface is designed and constructed with transmitter and receiver phase lock loop sections, each acquiring velocity lock with respect to a 106.25 MHz reference clock signal. The transmitter phase lock loop section is maintained in velocity lock during serialization of a 10-bit encoded transmission character. The receiver phase lock loop section is operative in a phase-only mode during de-serialization and byte synchronization of a 1.0625 GHz serial data stream. VCO control voltages of both the transmitter and receiver phase lock loop sections are monitored and evaluated by a comparison circuit such that if the receiver phase lock loop section looses lock, its VCO control voltage will exceed a pre-determined lock range value, triggering an output of the comparison circuit. The output trigger of the comparison circuit automatically commands the receiver phase lock loop section to reacquire velocity lock and maintains the receiver phase lock loop section in velocity lock mode until such time as the receiver VCO control voltage returns to about its nominal value. Frequency lock correction is applied to the receiver phase lock loop section automatically and is a function solely of the receiver phase lock loop frequency deviation from its nominal value.

REFERENCES:
patent: 4584690 (1986-04-01), Cafiero et al.
patent: 5319798 (1994-06-01), Watanabe
patent: 5481207 (1996-01-01), Craft
patent: 5550860 (1996-08-01), Georgiou et al.
patent: 5566204 (1996-10-01), Kardontchik et al.
patent: 5621755 (1997-04-01), Bella et al.
patent: 5703511 (1997-12-01), Okamoto
patent: 5745532 (1998-04-01), Campana, Jr.

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