SYSTEM AND METHOD FOR VOLTAGE-CONTROLLED OSCILLATOR CALIBRATION
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United States of America Patent
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Aug 11, 2016
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Sep 25, 2015
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Abstract
A system and method for calibrating a Voltage-Controlled Oscillator (VCO) having both fine-tuning control and coarse-tuning control. The VCO frequency can vary monotonically with changes in each of one or more operational conditions. The calibration method determines the coarse-tuning control setting for the VCO at system start-up. The method comprises generating frequency characterization data, generating a polynomial function from the characterization data, calculating the fine-tuning control voltage based on the polynomial function and a measurement of the operational conditions, and sweeping through all the coarse-tuning control settings to determine the coarse-tuning control setting that generates the closest VCO frequency to a target frequency when using the calculated fine-tuning control voltage.
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