Regulated charge pump with digital resistance cont

专利名称：Regulated charge pump with digital

resistance control

发明人：Yee Ling Cheung,Chun-Ying Chen申请号：US11585841申请日：20061025公开号：US075570B2公开日：20090707

专利附图：

摘要：A charge pump includes a resistor divider connected between an output voltagenode and ground and a comparator inputting a reference voltage at one input, and adivided voltage from the resistor divider at another input. A digital control circuit is

enabled by the comparator. A first transistor and a second transistor are in series

between an input voltage node and the ground, both transistors controlled by the digitalcontrol circuit. A pump capacitor is connected between to the output voltage node andbetween the first and second transistor, and being charged by turning the first andsecond transistors on and off. A first diode is between the pump capacitor and the inputvoltage node. A second diode between the pump capacitor and the output voltage node.A reservoir capacitor between the output voltage node and ground. The digital controlcircuit comprises a first shift register. The first transistor comprises a first plurality ofparallel transistors, the first shift register includes any of a first plurality of DQ, RS or JKflip flops connected in series, and outputs of the flip flops control gates of the firstplurality of parallel transistors.

申请人：Yee Ling Cheung,Chun-Ying Chen

地址：Irvine CA US,Irvine CA US

国籍：US,US

代理机构：Sterne, Kessler, Goldstein & Fox P.L.L.C.

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