Wide output-range charge pump with active biasing current

Details Wide output-range charge pump with active biasing current Wide output-range charge pump with active biasing current

2007-01-09

2007-01-09

Tra, Quan (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Synchronizing

Reexamination Certificate

active

10787954

ABSTRACT:
A charge pump circuit includes a charge pump having an output voltage. A replica circuit actively matches up and down currents in the charge pump. A charge pump bias current transistor biases the charge pump. The charge pump includes four switches driven by differential UP and DOWN signals. The charge pump includes a first tail current source connected between a supply voltage and two of the four switches that are driven by the differential UP signal, and a second tail current source connected between a supply voltage and two of the four switches that are driven by the differential DOWN signal. The charge pump includes an operational amplifier whose output is connected to an output of one of the tail current sources. A dump capacitor is connected to a negative input of the operational amplifier. The replica circuit includes four transistors, two of which match the first and second tail current sources, and the other two match the switches driven by the differential UP and DOWN signals. The replica circuit includes a second operational amplifier that matches the charge up and down current for varied output voltage. A low pass filter is at the output voltage and includes a resistor-capacitor network.

REFERENCES:
patent: 6181210 (2001-01-01), Wakayama
patent: 6326852 (2001-12-01), Wakayama
patent: 6526111 (2003-02-01), Prasad
patent: 6727736 (2004-04-01), Tsang et al.
patent: 6771114 (2004-08-01), Watarai
patent: 2004/0004500 (2004-01-01), Byun et al.
patent: 2004/0085106 (2004-05-01), Jeong
patent: 2004/0257162 (2004-12-01), Mokeddem

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