Apparatus and method for acquiring data and clock pulses from as

Details Apparatus and method for acquiring data and clock pulses from as Apparatus and method for acquiring data and clock pulses from as

1986-03-26

1987-11-17

Griffin, Robert L.

Pulse or digital communications

Spread spectrum

Direct sequence

328 72, 307269, H04L 702

Patent

active

047078421

ABSTRACT:
A digital phase control circuit incorporates a phase detector and a controllable oscillator controlled by an internal clock. The oscillator is formed as a presettable counter which is counted by the internal clock and preset with a variable intial value corresponding to a function of the frequency of the current data clock derived from an incoming data stream. The phase detector is formed as a shift register for delaying data signals, a counter storage register associated with a counter, and an intermediate storage register associated with the shift register, the storage registers manifesting the state of the counter or the state of the shift register at a predetermined time during an operating cycle, as indicated by the counter. Depending on the position of a data signal in the shift register when the counter reaches a predetermined state, one of the storage registers is selected for connection to a rated value generator for selection of a new rated value for presetting the counter, such new rated value being selected in accordance with the frequency of the current data clock and with the phase-signifying content of one of the storage registers.

REFERENCES:
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patent: 4472818 (1984-09-01), Zapisek et al.
patent: 4535461 (1985-08-01), Stepp et al.

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