Timing signal recovery circuit for a data transmission system

Details Timing signal recovery circuit for a data transmission system Timing signal recovery circuit for a data transmission system

1989-12-21

1991-06-04

Olms, Douglas W.

Pulse or digital communications

Spread spectrum

Direct sequence

331 17, 331 25, H03D 324

Patent

active

050220586

ABSTRACT:
A timing signal recovery circuit for recovering a timing signal from a received signal includes a circuit for extracting a timing signal from the received signal; a voltage-controlled oscillator (VCO) to generate a local timing signal; a phase-difference detecting circuit for detecting a phase difference between the extracted timing signal and the local timing signal; a loop filter responsive to the detected phase difference for generating a VCO control voltage supplied to the VCO; and a circuit for controlling the loop filter such that the VCO control voltage remains substantially within a predetermined voltage range. The loop filter control circuit substantially prevents instability of the VCO.

REFERENCES:
patent: 4500857 (1985-02-01), Bosselaers et al.
patent: 4523150 (1985-06-01), Hogeboom
patent: 4607296 (1986-08-01), Smidth
patent: 4680778 (1987-07-01), Krinock
patent: 4712077 (1987-12-01), Ansell et al.
patent: 4769704 (1988-09-01), Hirai et al.
patent: 4809068 (1989-02-01), Nagai

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