Phase synchronizing circuit

Details Phase synchronizing circuit Phase synchronizing circuit

1980-12-01

1983-07-19

Grimm, Siegfried H.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Plural a.f.s. for a single oscillator

328155, 331 22, 331 25, 375118, 375120, H03L 708

Patent

active

043946267

ABSTRACT:
A phase synchronizing circuit, wherein two phase detectors are used in quadrature to detect the phase of an input signal and to avoid hang-up when the phase of the input signal changes abruptly by 180.degree.. The two detected phase signals are then multiplied by a locally generated reference signal and re-combined, so that a synchronized output signal having reduced phase jitter results. This circuit is also incorporated in an N-phase PSK system, where it is used as a synchronizer and not as a demodulator. In a receiver for such a PSK system, the frequency of the received signal is multiplied by N, the phase synchronizer circuit of the invention is then used to extract the carrier (at a N times higher frequency), and a divider is then used to convert the synchronized carrier provided by the synchronizer circuit of the invention down to the original frequency.

REFERENCES:
patent: 3961262 (1976-06-01), Gassmann
patent: 3993956 (1976-11-01), Gilmore et al.
patent: 4314206 (1982-02-01), Attwood et al.
patent: 4318049 (1982-03-01), Mogensen

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