Digitally-controlled oscillator

Details Digitally-controlled oscillator Digitally-controlled oscillator

2006-11-07

2006-11-07

Kinkead, Arnold (Department: 2817)

Oscillators

Automatic frequency stabilization using a phase or frequency...

Afc with logic elements

C331S034000, C331S17700V, C331S057000, C327S156000, C327S158000, C327S159000

Reexamination Certificate

active

07132895

ABSTRACT:
A digitally-controlled oscillator comprises an input for the supply of a digital input word, an adder, a stable local oscillator and a delay circuit, comprising a delay stage with a number of serially-connected coarse delay elements and a fine delay stage with a number of serially-connected fine delay elements. The coarse delay stage and the fine delay stage are embodied such that the maximum total delay and the minimum total delay differ by at most one period of the cycle signal. The delay produced by the number of fine delay elements corresponds to the delay of one coarse delay element. Each coarse delay element and each fine delay element comprise their own controllable selector.

REFERENCES:
patent: 5602884 (1997-02-01), Wieczorkiewicz et al.
patent: 6114915 (2000-09-01), Huang et al.
patent: 6222407 (2001-04-01), Gregor
patent: 6259330 (2001-07-01), Arai
patent: 6480047 (2002-11-01), Abdel-Maguid et al.
patent: 2002/0008557 (2002-01-01), Abdel-Maguid et al.

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