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

H - Electricity

04

L

328/0.2

H04L 7/033 (2006.01) H03L 7/093 (2006.01) H03L 7/099 (2006.01)

Patent

CA 1291539

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.

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