Method and apparatus for pattern independent phase detection and

Details Method and apparatus for pattern independent phase detection and Method and apparatus for pattern independent phase detection and

1992-05-06

1995-10-17

Chin, Stephen

Pulse or digital communications

Synchronizers

Frequency or phase control using synchronizing signal

375371, H04L 704, H04L 700

Patent

active

054597536

ABSTRACT:
A timing recovery scheme disposed to be substantially invariant to the specific composition of an input data sequence. The phase detection network of the present invention will typically be addressed by a data waveform having a plurality of data packets separated by data delimiters. In operation, the phase detection network of the present invention generates a phase error signal in response to the phase difference between a binary data waveform and a periodic clock waveform recovered therefrom. The inventive phase detection network includes a shift register for storing samples of the incident data waveform. The contents of the shift register are monitored by a boundary detection circuit disposed to signal the presence of one of the delimiters within the shift register. Upon detection of such a delimiter a boundary correction circuit is disposed to generate a phase detection enable signal. The inventive phase detection network further includes a phase detector which is operative, upon being enabled by the boundary correction circuit, to compare the relative phase between the data and clock waveforms in order to synthesize the phase error signal.

REFERENCES:
patent: 3980826 (1976-09-01), Widmer
patent: 4119796 (1978-10-01), Jones
patent: 5313501 (1994-05-01), Thacker

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