Phase-locked loop frequency synthesizer

Details Phase-locked loop frequency synthesizer Phase-locked loop frequency synthesizer

1996-07-30

1998-06-09

Chin, Stephen

Pulse or digital communications

Synchronizers

Phase displacement, slip or jitter correction

331 18, 331 25, H03D 324

Patent

active

057647119

ABSTRACT:
A phase-locked loop (PLL) frequency synthesizer is described that both reduces frequency channel spacing and accelerates convergence, and moreover, suppresses the occurrence of spurious noise. A frequency dividing circuit of the PLL frequency synthesizer is composed of a plurality of frequency dividers. By means of a timing generation circuit that is operated by frequency signals from an external oscillation circuit, each of frequency dividers are sequentially delayed by each cycle, and the output of these frequency dividers is taken as feedback signals of the phase comparator of the phase-locked loop.

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H. Adachi et al., "High Speed Frequency Switching Synthesizer Using Fractional N Phase Locked Loop", J. of the Inst. of Elec., Info. and Comm. Eng., vol. J76-C-1, No. 11, Nov. 1993, pp. 445-447.

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