Continuously variable synchronizer apparatus

Details Continuously variable synchronizer apparatus Continuously variable synchronizer apparatus

1986-06-30

1987-12-15

Buczinski, Stephen C.

Pulse or digital communications

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Direct sequence

375120, 455 69, H04L 700, H03D 324

Patent

active

047138300

ABSTRACT:
A system is illustrated for making sure that received data and the master clock are in the proper relationship even though temperature, voltage supplies and aging cause variable transmission time delays between the source of data and the local circuit. This proper relationship is accomplished by detecting the phase difference between a local master oscillator and the received data and providing a clock signal to be used by the remote data sending device in a system phase-locked loop using a slave oscillator and the previously mentioned phase detection circuit. The slave oscillator tracks the frequency of the master oscillator and the phase of the incoming data. Since a clock signal was previously required for prior art systems, this approach eliminates the return clock that was required if the cable length and the associated data signal delay parameters could vary.

REFERENCES:
patent: 3128465 (1964-04-01), Brilliant
patent: 3588703 (1971-06-01), Sorkin et al.
patent: 4535459 (1985-08-01), Hogge, Jr.
patent: 4602375 (1986-07-01), Inukai
patent: 4628461 (1986-12-01), Adams

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