Charge pump circuit for a phase locked loop

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United States of America Patent

PATENT NO 9559708
APP PUB NO 20160344395A1
SERIAL NO

15229322

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Abstract

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Disclosed herein is a circuit including a phase frequency detector (PFD) configured to compare phases of an input signal and a feedback signal, and to generate first and second control signals as a function of that comparison. An attenuation circuit includes a capacitor coupled in series between a node and a switching node, and is configured to charge the capacitor and disconnect the switching node from ground based on assertion of the first control signal, and discharge the capacitor and connect the switching node to ground based on assertion of the second control signal.

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Patent Owner(s)

  • STMICROELECTRONICS INTERNATIONAL N.V.

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Lahiri, Abhirup Delhi, IN 19 87

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