Quotient phase-shift processor for digital phase-locked-loops

Details Quotient phase-shift processor for digital phase-locked-loops Quotient phase-shift processor for digital phase-locked-loops

1987-10-14

1989-08-29

Safourek, Benedict V.

Pulse or digital communications

Spread spectrum

Direct sequence

328 74, H03L 706

Patent

active

048624853

ABSTRACT:
A quotient phase-shift processor is provided which includes novel techniques for realizing phase corrections of a digital phase-locked-loop. A binary phase-detector of the "early-late" type is combined with range-phase-detector circuitry to generate a variable lock acquisition speed. Phase measure and speed control are performed by incremental manipulation which feeds a novel "quotient" processor. The quotient processor integrates the incremental phase errors and performs phase corrections in a nonperiodic fashion, resulting in lower effective proportional loop gain than that provided in standard phase-locked-loops. Wide capture-range and low jitter are obtained by dynamically varying a loop time constant. Pattern dependent noise is reduced by a novel gating technique. High crystal-frequency requirements are reduced, extending the spectral application of digital phase-locked-loops.

REFERENCES:
patent: 4385396 (1983-05-01), Norton
patent: 4534044 (1985-08-01), Funke et al.
patent: 4633193 (1986-12-01), Scordo
patent: 4713630 (1987-12-01), Matthews

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