Miscellaneous active electrical nonlinear devices – circuits – and – Specific identifiable device – circuit – or system – With specific source of supply or bias voltage
Reexamination Certificate
2005-01-25
2005-01-25
Ton, My-Trang Nu (Department: 2816)
Miscellaneous active electrical nonlinear devices, circuits, and
Specific identifiable device, circuit, or system
With specific source of supply or bias voltage
Reexamination Certificate
active
06847251
ABSTRACT:
A differential charge pump circuit for eliminating influence of mismatches between current sources is disclosed. The differential charge pump circuit includes a floating capacitor for providing an output voltage, a slicer for outputting a comparison signal to control a charge/discharge actions of the floating capacitor, a first current source, a second current source, a first-common-mode current source, a second-common-mode current source, and a third-common-mode current source connected in parallel with the first current source. The differential charge pump circuit of the present invention utilizes switches to switch the charge and discharge current paths of the capacitor with respect to the common mode current source and the charge/discharge current source. Therefore, the duty cycle of the output signal is free from being adversely influenced by the mismatches between the current sources.
REFERENCES:
patent: 5736880 (1998-04-01), Bruccoleri et al.
patent: 6249181 (2001-06-01), Marble
patent: 6255873 (2001-07-01), Johnson et al.
patent: 6275097 (2001-08-01), Liang et al.
patent: 6525684 (2003-02-01), Tsujikawa
patent: 6580326 (2003-06-01), Bach et al.
Birch & Stewart Kolasch & Birch, LLP
Media Tek Inc.
Nu Ton My-Trang
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