Phase-locked loop systems and methods

Details Phase-locked loop systems and methods Phase-locked loop systems and methods

2006-01-19

2008-10-21

Donovan, Lincoln (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Synchronizing

C330S253000, C375S374000, C375S376000

Reexamination Certificate

active

07439783

ABSTRACT:
Improved common mode feedback techniques are provided for charge pumps, phase-locked loops (PLLs), and other circuits. For example, in accordance with an embodiment of the present invention, a circuit includes a loop filter having first and second loop filter nodes. An amplifier is provided having first and second differential inputs respectively coupled to the first and second loop filter nodes. A first current source is coupled to the first loop filter node and a second current source is coupled to the second loop filter node. The first and second current sources continuously adjust a common mode voltage of the loop filter nodes.

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International Search Report and Written Opinion of the ISA, mailed to applicant Apr. 7, 2008.

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