Phase-locked loop synthesizer

Details Phase-locked loop synthesizer Phase-locked loop synthesizer

1997-03-14

1999-04-06

Dinh, Son T.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Particular error voltage control

331 1R, 331DIG2, 327156, 327159, H03L 708, H03K 5159

Patent

active

058924078

ABSTRACT:
A PLL synthesizer includes a reference oscillator, an controllable oscillator which generates an oscillation signal which varies in frequency according to a control signal, a phase comparator, and a loop filter. The loop filter includes an A/D converter, a digital filter, and a D/A converter. The digital filter removes high-frequency components from the output of the A/D converter according to setting data. The digital filter is set to a filter characteristic depending to a selected frequency of the oscillation signal. The digital output signal of the digital filter is converted to an analog signal which is used as the control signal of the controllable oscillator.

REFERENCES:
patent: 5337335 (1994-08-01), Cloetens et al.
patent: 5552727 (1996-09-01), Nakao
patent: 5572157 (1996-11-01), Takashi et al.
patent: 5696468 (1997-12-01), Nise

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