Differential charge pump with common-mode feedback compensation

Details Differential charge pump with common-mode feedback compensation Differential charge pump with common-mode feedback compensation

2006-07-11

2006-07-11

Callahan, Timothy P. (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Synchronizing

C327S067000, C330S259000, C331S017000

Reexamination Certificate

active

07075348

ABSTRACT:
A differential charge pump includes a first current, a second current, a first switching device, a second switching device, a first phase inverting switching device, a second phase inverting switching device, and a common mode feedback device. The common mode feedback device is used to adjust the current level exported by the first current source, according to the common mode voltage of the differential charge pump, so that the respective currents exported by the first current source and the second current source are to be the same. The present invention has used the property that the common mode voltage of the differential charge pump should be a constant value, so as to correct the level of the current source. As a result, the current exported by the differential charge pump can be precisely corrected. Also, the present invention only needs one charge pump, so that the structure is simple and the fabrication is easy. In addition, no matter whether there is a rising or falling signal, the correction can be performed. Therefore, it has no issue of shift for the common mode voltage.

REFERENCES:
patent: 6107859 (2000-08-01), Moyal
patent: 6181210 (2001-01-01), Wakayama
patent: 6590422 (2001-07-01), Dillon
patent: 6617888 (2003-09-01), Volk

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