Automatic frequency calibration apparatus and method for a phase-locked loop based frequency synthesizer
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United States of America Patent
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Jul 19, 2011
Grant Date -
Aug 26, 2010
app pub date -
Apr 14, 2009
filing date -
Feb 24, 2009
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Abstract
An automatic frequency calibration apparatus and a method thereof for a phase-locked loop based frequency synthesizer are disclosed. The apparatus includes a frequency-to-digital converter configured to convert a frequency of a VCO output signal to a first digital value, a target value setting section configured to provide a second digital value corresponding to a target frequency, and a finite state machine configured to calibrate the frequency of the VCO output signal by using the difference of the first digital value and the second digital value. Accordingly, the calibration speed and a frequency resolution of the automatic frequency calibration apparatus in a frequency synthesizer may be enhanced.
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