Low voltage low power bandgap circuit

专利名称：Low voltage low power bandgap circuit发明人：Xiaoyu Xi申请号：US10951019申请日：20040927公开号：US06995587B2公开日：20060207

专利附图：

摘要：Disclosed are methods and circuits for providing a bandgap reference in anelectronic circuit having a supply voltage and ground. The methods include steps forgenerating a bandgap reference current, mirroring the bandgap reference current,summing the mirrored currents, and modulating and outputting a bandgap reference

voltage from the sum. Representative preferred embodiments are disclosed in which themethods of the invention are used in providing under-voltage protection and in providinga regulated output voltage. Circuits are disclosed for a bandgap reference voltagegenerator useful for providing a bandgap reference voltage in a circuit. A first currentmirror for provides current from a supply voltage. A bandgap reference current circuitbetween the first current mirror and ground is configured for deriving a bandgap currentproportional to absolute temperature. A second current mirror and control circuit areprovided for summing the mirrored currents and modulating a bandgap referencevoltage output. Preferred embodiments of the invention include a bandgap under-voltage detection circuit using a comparator and a voltage regulator circuit having aregulated voltage output capability.

申请人：Xiaoyu Xi

地址：Plano TX US

国籍：US

代理人：W. Daniel Swayze, Jr.,W. James Brady,Frederick J. Telecky, Jr.

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