Differential charge pump

Details Differential charge pump Differential charge pump

2007-02-27

2007-02-27

Vo, Don N. (Department: 2611)

Pulse or digital communications

Synchronizers

Phase displacement, slip or jitter correction

C375S376000, C327S157000

Reexamination Certificate

active

10672798

ABSTRACT:
A differential charge pump includes a transient reducing circuit that provides multiple switching current paths to reduce transients caused by the charge transfer as the charge pump is switched. The differential charge pump includes separate current sources in the transient reducing circuit that are switchably coupled to the non-active current source in the charge pump. In one embodiment, each current sources include a static current source and a variable current source that is controlled by a common mode feedback circuit. The variable current source may produce a current with less magnitude than the current produced by the static current source.

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Ian A. Young, “A PLL Clock Generator with 5 to 110 MHz of Lock Range for Microprocessors”, IEEE Journal of Solid-State Circuits, vol. 27, No. 11, Nov. 1992, pp. 1599-1607.
Ilya I. Novof, “Fully Integrated CMOS Phase-Locked Loop with 15 to 240 MHz Locking Range and ±ps Jitter”, IEEE Journal of Solid-State Circuits, vol. 30, No. 11, Nov. 1995, pp. 1259-1266.

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