Device for calibrating the frequency of an oscillator, phase...

Details Device for calibrating the frequency of an oscillator, phase... Device for calibrating the frequency of an oscillator, phase...

2006-10-31

2006-10-31

Kinkead, Arnold (Department: 2817)

Oscillators

Automatic frequency stabilization using a phase or frequency...

Tuning compensation

C331S00100A, C331S034000, C331S17700V, C327S156000, C327S159000, C327S160000

Reexamination Certificate

active

07129793

ABSTRACT:
A device calibrates the frequency of an oscillator. The oscillator has first and second inputs and generates an output frequency responsive to a first voltage signal at the first input. The calibration device generates a calibration signal applied at the second input of the oscillator for calibrating its output frequency and comprises a counter. The counter has a first input frequency proportional to a reference frequency and a second input frequency proportional to the output frequency. The counter counts the time window number given by the ratio of the second to first frequencies. The device comprises a comparator that compares the counted time window number with a prefixed time window number. The calibration device changes the value of the calibration signal if the counted time window number is different from the prefixed time window number and until the counted time window number is equal to the prefixed time window number.

REFERENCES:
patent: 5382922 (1995-01-01), Gersbach et al.
patent: 6078633 (2000-06-01), Shiotsu et al.
patent: 6496556 (2002-12-01), Huehne et al.
patent: 6522206 (2003-02-01), Kornblum et al.
patent: 6566966 (2003-05-01), Bellaouar et al.
patent: 2003/0042985 (2003-03-01), Shibahara et al.
patent: 2003/0197564 (2003-10-01), Humphreys et al.

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