Device for recovery of clock frequency in digital transmission

Details Device for recovery of clock frequency in digital transmission Device for recovery of clock frequency in digital transmission

1983-03-14

1986-02-04

Griffin, Robert L.

Pulse or digital communications

Spread spectrum

Direct sequence

307511, 455260, H04L 704

Patent

active

045690642

ABSTRACT:
The device for recovery of the clock frequency of a digital signal comprises a rectifier, a filter having a very narrow bandwidth coupled to the first input of a phase comparator of analog type, a controlled oscillator, the output of which delivers the recovered clock signal and is coupled to the second input of the phase comparator via a low-pass filter. The output of the phase comparator is connected to the input of a loop filter, the output of which is connected to the control input of the oscillator.

REFERENCES:
patent: 3047660 (1962-07-01), Costas
patent: 3569853 (1971-03-01), Wolejsza, Jr.
patent: 3815029 (1974-06-01), Wilson
patent: 3934205 (1976-01-01), Bogert
patent: 3947772 (1976-03-01), Sato
patent: 3962541 (1976-06-01), Seidel
patent: 4000476 (1976-12-01), Walker et al.
patent: 4380815 (1983-04-01), Clendening
patent: 4388730 (1983-06-01), Nash et al.
Bruyland "Optimum Acquisition of the Idling First Order Phase-Lock Loop" pp. 643-647 IEEE Transaction on Aerospace and Electronic Systems.
Turner "Evaluation of Cellular Mobile Telephone Data Receiver" pp. 353-360 IEEE Transaction on Vehicular Tech, Nov., 1980, N.Y.
L. Harms "Wirkungsweise und Anwendung von Phasen-und Frequenzrisen-eine Ubersicht" pp. 296-301, Nachrichtenechnik-Elektronik, vol. 25, No. 8, aout 1975.

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