Frequency synthesizer

Details Frequency synthesizer Frequency synthesizer

1995-04-21

1996-05-28

Chin, Stephen

Pulse or digital communications

Synchronizers

Phase displacement, slip or jitter correction

331 11, 331 18, H03D 324

Patent

active

055219489

ABSTRACT:
A frequency synthesizer includes a voltage-controlled oscillator, frequency dividing circuits, a signal source, phase comparing circuits, an adding circuit, a converting circuit and a control circuit. The frequency dividing circuits divide an output supplied thereto from the voltage-controlled oscillator with frequency-dividing ratios of 1/N and 1/(N+1) where N is an arbitrary integer. The signal source outputs a reference frequency signal. The phase comparing circuits phase-compare a signal divided by N supplied thereto from one frequency dividing circuit and a signal divided by (N+1) supplied thereto from another frequency dividing circuit and the reference frequency signal from the signal source. The adding circuit adds a signal which results from phase-comparing the reference frequency signal output from the phase comparing circuit and the signal divided by N and a signal which results from phase-comparing the reference frequency signal output from the phase comparing circuit and the signal divided by (N+1). The converting circuit converts an output from the adding circuit to a DC signal and supplies the same to the voltage-controlled oscillator. The control circuit controls frequency-dividing ratios of the frequency dividing circuits. The control circuit cyclically changes the frequency-dividing ratios of the frequency dividing circuits to 1/N or 1/(N+1).

REFERENCES:
patent: 4888564 (1989-12-01), Ishigaki
patent: 4970473 (1990-11-01), Lietar
patent: 5038117 (1991-08-01), Miller
patent: 5256981 (1993-10-01), Fountain
patent: 5365202 (1994-11-01), Mori

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