Device for calibrating the frequency of an oscillator, phase looked loop circuit comprising said calibration device and related frequency calibration method
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United States of America Patent
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Oct 31, 2006
Grant Date -
Jul 21, 2005
app pub date -
Dec 28, 2004
filing date -
Dec 29, 2003
priority date (Note) -
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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.
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