Digital phase-locked loop circuit

Details Digital phase-locked loop circuit Digital phase-locked loop circuit

2007-05-15

2007-05-15

Kinkead, Arnold (Department: 2817)

Oscillators

Automatic frequency stabilization using a phase or frequency...

Tuning compensation

C331S00100A, C331S034000, C331S017000

Reexamination Certificate

active

10935863

ABSTRACT:
A digital phase-locked loop circuit includes a counter for outputting a count value corresponding to an output frequency outputted by a voltage controlled oscillator in response to a control voltage signal, a comparator for comparing the count value from the counter with a target value associated with a target frequency output and for outputting a comparison signal according to a comparison result therebetween, a digital reference value generator for outputting a digital reference value according to the comparison signal from the comparator and including a register for storing the digital reference value therein, and a digital-to-analog converter for generating the control voltage signal based on the digital reference value received from the digital reference value generator.

REFERENCES:
patent: 6731101 (2004-05-01), Miyagawa et al.
patent: 6809599 (2004-10-01), Shimoda
patent: 2005/0052208 (2005-03-01), Starr
patent: 1205577 (1999-01-01), None
China Office Action issued Jul. 7, 2006.

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