Linear low noise phase-frequency detector
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United States of America Patent
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Dec 14, 1999
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app pub date -
Oct 5, 1998
filing date -
Oct 5, 1998
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Abstract
A phase-frequency detector (110) includes an output stage (300) and a control stage (200). The output stage includes a pump up switched current source (350), a pump down switched current sink (360), and a constant current source (325) that are coupled to a charge pump output node (111). The control stage generates, in response to a divided variable frequency signal (FV) (136) and a reference frequency signal (FR) (106), a pump up control signal (246) and a pump down control signal (216).
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