Arrangement for recovering a clock signal from an angle-modulate

Details Arrangement for recovering a clock signal from an angle-modulate Arrangement for recovering a clock signal from an angle-modulate

1985-07-18

1987-06-23

Griffin, Robert L.

Pulse or digital communications

Repeaters

Testing

375 88, 375110, 328 20, H03D 300

Patent

active

046758810

ABSTRACT:
An arrangement for recovering a clock signal of frequency 1/T from an angle-modulated carrier signal having a modulation index m=0.5 comprises a frequency doubler, a circuit for generating a clock signal component from the frequency-doubled signal, a clock filter for selecting the generated clock signal component and a pulse shaper for producing a clock pulse signal.
The arrangement produces a reliable clock signal within a very short time after the start of the signal reception, because the frequency doubler comprises a hard limiter, a first bandpass filter connected thereto and having a Q.ltoreq.10, a balanced modulator connected to the limiter and to the first bandpass filter and a second bandpass filter having a Q.ltoreq.10 tuned to twice the carrier frequency 2f.sub.c ; and because the generating circuit comprises a frequency converter for converting the frequency-doubled signal to a frequency band around a carrier frequency f.sub.o of the order of twice the clock frequency 2/T, a bandstop filter tuned to frequency f.sub.o and having a Q.ltoreq.10 and a squaring circuit connected to the band stop filter. The arrangement is attractive for use in receivers for radio communication systems which require a very fast acquisition of the correct clock phase.

REFERENCES:
patent: 4232387 (1980-11-01), Cottatellucci
patent: 4250456 (1981-02-01), Shinmyo et al.
patent: 4539524 (1985-09-01), Goode

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