PLL synthesizer apparatus

Details PLL synthesizer apparatus PLL synthesizer apparatus

1997-04-21

1999-04-06

Kinkead, Arnold

Oscillators

Automatic frequency stabilization using a phase or frequency...

Afc with logic elements

377 48, 377 49, 377 52, 327115, 327159, 327160, H03K 2300

Patent

active

058924051

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: 4573176 (1986-02-01), Yeager
patent: 5712595 (1998-01-01), Yokoyama

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