Digital delay line based frequency synthesizer
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United States of America Patent
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Apr 3, 2012
Grant Date -
Aug 14, 2008
app pub date -
Jan 29, 2008
filing date -
Feb 9, 2007
priority date (Note) -
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Abstract
A frequency synthesizer is disclosed. The frequency synthesizer includes a period control word generator, a delta-sigma modulator, and a delay line unit. The period control word generator generates a period control word. The delta-sigma modulator receives the period control word and generates a phase selection signal. The delay line unit generates an output clock based on the phase selection signal. The delta-sigma modulator performs a carry-in operation based on a base number and the base number is adjustable and determined by a calibration process of the delay line unit.
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