PLL synthesizer apparatus

Details PLL synthesizer apparatus PLL synthesizer apparatus

1998-11-25

2000-07-25

Kinkead, Arnold

Oscillators

Automatic frequency stabilization using a phase or frequency...

Afc with logic elements

331 17, 377 48, 377 49, 377 52, 327159, 327160, 327115, H03K 2300, H03L 708, H03L 718

Patent

active

060941006

ABSTRACT:
Disclosed herein is a fractional N-type PLL frequency synthesizer apparatus. A fractional N-type control circuit employed therein for varying N values for each reference cycle is constructed of a combination of a frequency divider (comprising D flip-flops) and a logic circuit (comprising an exclusive OR circuit, AND circuits and an OR circuit), taking the timing provided to output a carry signal into consideration in advance. Owing to such a construction, the fractional N-type PLL frequency synthesizer apparatus can be activated with low noise and can provide a short lockup time.

REFERENCES:
patent: 4271531 (1981-06-01), Torii
patent: 4573023 (1986-02-01), Cok et al.
patent: 4573176 (1986-02-01), Yeager
patent: 5712595 (1998-01-01), Yokoyama
patent: 5892405 (1999-04-01), Kamikubo et al.
Huehne K. et al.; "A Single-Chip, 1.2 GHZ, PLL Frequency Synthesizer Using Reduced Capacitance, Dual Gate, Bicmos Technology" Proceedings of the Custom Integrated Circuits Conference, Boston, May 3-6, 1992; pp. 24.3.1--24.3.5.

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