Phase detecting circuit

Details Phase detecting circuit Phase detecting circuit

1987-02-24

1989-02-07

Miller, Stanley D.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

328109, 328134, 329112, 307262, H03B 364, G01R 2500, H03K 526

Patent

active

048033855

ABSTRACT:
A phase detecting circuit for detecting a phase differential between a reference clock and a bit timing extracted from a demodulated signal, which is derived from a modulation wave modulated by a digital signal. The circuit successfully eliminates points of discontinuity in the phase detection characteristic of a phase detector and, therefore, accurately determines a phase differential between the bit timing and the reference clock with no regard to the magnitude of the phase differential of an input. An absolute value averaging circuit is provided for averaging the absolute valves of a plurality of consecutive outputs of a phase detector. A sign majority decision circuit is provided for producing one of positive and negative signs of the consecutive outputs of the phase detector which is decided by majority. Further, a multiplier is provided for multiplying an output of the absolute value averaging circuit and an output of the majority decision circuit, the resulting product being delivered as a phase differential.

REFERENCES:
patent: 3344353 (1967-09-01), Wilcox
patent: 3548321 (1970-12-01), Duquesne
patent: 3931585 (1976-01-01), Barker et al.
patent: 4096442 (1976-06-01), McRae et al.

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