Segmented fractional-N PLL
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United States of America Patent
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Feb 18, 2014
Grant Date -
Apr 25, 2013
app pub date -
Sep 13, 2012
filing date -
Oct 20, 2011
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Abstract
A Fractional-N PLL includes a phase frequency detector module receiving a first clock and a second clock that is associated with a feedback path arrangement. A coarse phase adjustment module receives a coarse phase component and an output signal associated with a divider module used in the feedback path arrangement and performs a coarse phase adjustment. A fine phase adjustment module performs fine phase adjustment using a fine phase component and the coarse phase adjustment as input to produce the second clock. The fine phase adjustment module nominally cancels most or all of the quantization noise present during the coarse phase adjustment, thereby greatly reducing the net phase noise of the divider module. A segmentation module receives a control signal and generates the coarse phase component and the fine phase component that are provided to the fine phase adjustment module and the coarse phase adjustment module for processing.
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