Low-voltage, low static phase offset differential charge pump

Details Low-voltage, low static phase offset differential charge pump Low-voltage, low static phase offset differential charge pump

2007-02-27

2007-02-27

Ton, My-Trang Nu (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Synchronizing

Reexamination Certificate

active

10927979

ABSTRACT:
A charge pump circuit with resistively attenuated inputs is described herein. By reducing a voltage swing of input signals supplied thereto, the charge pump circuit described herein is configured for producing output signals with relatively low static phase offset even when operating at relatively low power supply voltages (e.g., less than about 1.2 volts). In general, the input voltage swing may be reduced by coupling an attenuator to each input of the charge pump circuit. A method for operating the differential charge pump is described, along with exemplary devices (e.g., PLL and DLL devices) within which the charge pump may be utilized.

REFERENCES:
patent: 5363066 (1994-11-01), Chen et al.
patent: 5670869 (1997-09-01), Weisenbach
patent: 6141169 (2000-10-01), Pietruszynski et al.
patent: 6222402 (2001-04-01), Boerstler et al.
patent: 6384638 (2002-05-01), Nayebi et al.
patent: 6452441 (2002-09-01), Kim et al.
patent: 6879816 (2005-04-01), Bult et al.

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