Phase locked loop system and working method thereof
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United States of America Patent
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Issued Date -
Jun 26, 2014
app pub date -
Oct 24, 2013
filing date -
Oct 24, 2012
priority date (Note) -
Abandoned
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Abstract
A PLL system includes: an input end; an output end; a first PFD; a first CHP connected to the first PFD; a first LPF connected to the first CHP; a first VCO connected to the first CHP and the first LPF; a second PFD connected to the first VCO; a second CHP connected to the second PFD; a second LPF connected to the second CHP; a second VCO connected to the second CHP and the second LPF; a first DIV connected to the first PFD and the second VCO; and a second DIV connected to the second PFD and the second VCO. A working method of the PLL system is also provided, which can restrain input noise as well as phase noise of the second VOC in such a manner that noise of the PLL system is well restrained.
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