Reference frequency calibration module and apparatus using the same
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United States of America Patent
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Sep 12, 2017
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Mar 16, 2015
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Nov 5, 2014
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Abstract
A reference frequency calibration module is provided. The reference frequency calibration module includes an oscillator, a frequency divider, a phase-locked loop (PLL) and a frequency-offset calibration unit. The frequency divider couples to the oscillator. The phase-locked loop couples to the frequency divider. The frequency-offset calibration unit couples to the frequency divider and the phase-locked loop. The oscillator is configured for operatively generating an oscillating signal having an oscillating frequency. The frequency divider divides the oscillating signal having the oscillating frequency by a first division parameter to generate a first clock signal having a first reference frequency. The phase-locked loop generates a second clock signal having a second reference frequency according to the first clock signal. The frequency-offset calibration unit is configured for operatively generating the first division parameter according to the second clock signal.
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