Fast coarse tuning control for PLL frequency synthesizer
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United States of America Patent
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Jul 22, 2003
Grant Date -
Mar 13, 2003
app pub date -
Sep 4, 2001
filing date -
Sep 4, 2001
priority date (Note) -
Expired
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Abstract
The VCO of a synthesizer operates with a coarse tuning and a fine tuning. During the coarse tuning, a binary search method is used to match the VCO frequency to one of a finite number of discrete reference frequencies. The coarse tuning operates without frequency division and phase comparison in a closed feedback loop, thereby speeding up the settling time and increasing the lock-in range. The fine tuning operates as a conventional analog PLL.
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