Oscillator controller incorporating a voltage-controlled...

Details Oscillator controller incorporating a voltage-controlled... Oscillator controller incorporating a voltage-controlled...

2007-04-16

2009-10-20

Cho, James H. (Department: 2819)

Oscillators

Automatic frequency stabilization using a phase or frequency...

Plural a.f.s. for a single oscillator

C331S016000, C331S025000, C331S167000, C331S17700V

Reexamination Certificate

active

07605662

ABSTRACT:
An oscillator controller has a phase frequency detector that compares a reference signal and a frequency-divided signal and outputs a phase difference signal; a charge pump; a loop filter that filters the phase error signal output from the charge pump and outputs an oscillation frequency controlling voltage; a voltage-controlled oscillator; a first counter that counts the number of waves of the reference signal to a desired number and outputs a first flag signal; a second counter that counts the number of waves of the frequency-divided signal to the desired number and outputs a second flag signal; a first comparator that compares the first flag signal and the second flag signal and outputs a frequency comparison signal; and a control circuit that controls the voltage-controlled oscillator, the first counter, the second counter and the frequency divider by outputting signals thereto.

REFERENCES:
patent: 2001/0052823 (2001-12-01), Hirano et al.
patent: 2005/0237119 (2005-10-01), Irie
patent: 2006/0158264 (2006-07-01), Kousai et al.

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