Clock recovery circuit for TDMA system or message switching syst

Details Clock recovery circuit for TDMA system or message switching syst Clock recovery circuit for TDMA system or message switching syst

1980-06-20

1982-07-13

Heyman, John S.

Pulse or digital communications

Spread spectrum

Direct sequence

375113, 370104, 328110, 328119, 328164, H04L 700, H03K 904

Patent

active

043398243

ABSTRACT:
A burst communications clock recovery network is provided with a pair of clock signal extracting band-pass filters in order to provide both rapid clock recovery and a low noise clock signal. The first band-pass filter is provided with a relatively wide bandwidth and provides rapid clock recovery. The second band-pass filter has a relatively narrow bandwidth and provides a highly stable, low noise clock signal. The output of the clock recovery network is switched from the wide band-pass filter to the narrow band-pass filter when the average voltage from the wide bandpass filter decays to a predetermined value.

REFERENCES:
patent: 2942196 (1960-06-01), De Lange
patent: 3902014 (1975-08-01), Lindell et al.
patent: 3924068 (1975-12-01), Fletcher
patent: 4088832 (1978-05-01), Eastmond

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