Frequency modulated output clock from a digital phase locked...

Details Frequency modulated output clock from a digital phase locked... Frequency modulated output clock from a digital phase locked...

2005-12-30

2008-09-02

Pascal, Robert J. (Department: 2817)

Oscillators

Automatic frequency stabilization using a phase or frequency...

Afc with logic elements

C331S017000, C327S156000, C327S159000, C375S376000

Reexamination Certificate

active

07420426

ABSTRACT:
A frequency modulated output of a digital locked loop (DLL) is implemented with a Johnson Counter outputting a sample clock and a synchronized digital code at a multiple of the sample clock. The digital code drives a digital-to-analog converter to generate a frequency modulated control signal. The control signal is summed with the center frequency control from the digital locked loop digital filter to provide a frequency modulated center frequency control signal to the DLL oscillator.

REFERENCES:
patent: 5425074 (1995-06-01), Wong
patent: 6348823 (2002-02-01), Pan
patent: 6606004 (2003-08-01), Staszewski et al.
patent: 6664827 (2003-12-01), O'Leary et al.
patent: 7282999 (2007-10-01), Da Dalt et al.
patent: 2004/0213324 (2004-10-01), Hall et al.
patent: 2005/0122145 (2005-06-01), Ido et al.
patent: 2007/0152766 (2007-07-01), Herrin et al.

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