Synchronization detection circuit

Details Synchronization detection circuit Synchronization detection circuit

1986-04-07

1988-04-12

Groody, James J.

Pulse or digital communications

Spread spectrum

Direct sequence

371 1, H04L 700

Patent

active

047379715

ABSTRACT:
There is disclosed an asynchronous pulse catching circuit that, for each edge of the variable frequency input, regardless of duty cycle, will provide a pulse, synchronized to a high speed clock. There is also disclosed a pulse comparison circuit consisting of a state machine that provides slip detection between the variable input frequency and a reference input frequency. The circuit provides separate outputs indicating positive and negative slip.

REFERENCES:
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patent: 4516250 (1985-05-01), Grimes
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patent: 4545061 (1985-10-01), Hileman
patent: 4592050 (1986-05-01), Bensadon
F. M. Gardner, "A Cycle-Slip Detector for Phase-Locked Demodulators", Sep. 1977, pp. 251-254, IEEE Transactions on Instrumentation and Measurement, vol. 1M-26, No. 3.

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