Oscillators – Automatic frequency stabilization using a phase or frequency... – Afc with logic elements
Reexamination Certificate
2011-08-09
2011-08-09
Kinkead, Arnold (Department: 2817)
Oscillators
Automatic frequency stabilization using a phase or frequency...
Afc with logic elements
C331S016000, C331S034000, C327S156000, C327S159000, C375S376000
Reexamination Certificate
active
07994867
ABSTRACT:
An oscillator control apparatus has a digitally-controlled oscillator which outputs an oscillation signal having an oscillation frequency in response to an oscillator adjusting signal, a counter which counts the oscillation signal and outputs a count in response to a reference signal in synchronism with the oscillation signal, a time-to-digital converter which calculates a phase difference between the oscillation signal and the reference signal, an adder which adds the count and the phase difference and outputs the added value as first phase information, a corrector which corrects the first phase information in response to a phase control signal for setting an oscillation frequency of the digitally-controlled oscillator when a time difference between a rising-up timing of the oscillation signal and a rising-up timing of the reference signal is less than a predetermined time, and outputs second phase information, and a filter for smoothing a difference between the phase control signal and the second phase information, to output the oscillator adjusting signal.
REFERENCES:
patent: 7791428 (2010-09-01), Chang et al.
patent: 2009-21954 (2009-01-01), None
Robert Bogdan Staszewski, et al., “All-Digital TX Frequency Synthesizer and Discrete-Time Receiver for Bluetooth Radio in 130-nm CMOS”, IEEE Journal of Solid-State Circuits, vol. 39, No. 12, Dec. 2004, pp. 2278-2291.
Kabushiki Kaisha Toshiba
Kinkead Arnold
Oblon, Spivak McClelland, Maier & Neustadt, L.L.P.
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