Loop filter architecture
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United States of America Patent
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Jul 29, 2003
Grant Date -
Feb 6, 2003
app pub date -
Feb 8, 2002
filing date -
Jul 31, 2001
priority date (Note) -
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Abstract
A phase-lock loop (PLL) filter architecture includes a first charge pump (508) and a second change pump (510). The second charge pump (510) operates in opposite phase of the first charge pump (508) in order to take away excess charge from the loop filter capacitor(s). By using a second charge pump as described, the PLL filter does not require the use of a large capacitor and can therefore be integrated.
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