REFERENCE VOLTAGE GENERATION CIRCUIT, REGULATOR, SEMICONDUCTOR DEVICE

• Main Authors: YOSHII YUSUKE, INOUE YUKI
• Format: Patent
• Language: English; Japanese
• Published: 15.12.2016
• Subjects: BASIC ELECTRIC ELEMENTS; CONTROLLING; ELECTRIC SOLID STATE DEVICES NOT OTHERWISE PROVIDED FOR; ELECTRICITY; PHYSICS; REGULATING; SEMICONDUCTOR DEVICES; SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES

PROBLEM TO BE SOLVED: To provide a reference voltage generation circuit with a high output accuracy.SOLUTION: A reference voltage generation circuit 20 comprises: reference voltage sources 21A-21C that generate reference voltages VrefA-VrefC each having different temperature characteristics from each other; a comparator 23x that compares the reference voltage VrefA to the reference voltage VrefB and generates a comparison signal Sx; a comparator 23y that compares the reference voltage VrefB to the reference voltage VrefC and generates a comparison signal Sy; a logical operation section 24 that generates switching signals SA-SC from the comparison signal Sx and the comparison signal Sy; and a selector 22 that selects and outputs any of the reference voltages VrefA-VrefC according to the switching signals SA-SC as a reference voltage Vref.SELECTED DRAWING: Figure 5 【課題】出力精度の高い基準電圧生成回路を提供する。【解決手段】基準電圧生成回路２０は、それぞれ温度特性の異なる基準電圧ＶｒｅｆＡ〜ＶｒｅｆＣを生成する基準電圧源２１Ａ〜２１Ｃと、基準電圧ＶｒｅｆＡと基準電圧ＶｒｅｆＢとを比較して比較信号Ｓｘを生成するコンパレータ２３ｘと、基準電圧ＶｒｅｆＢと基準電圧ＶｒｅｆＣとを比較して比較信号Ｓｙを生成するコンパレータ２３ｙと、比較信号Ｓｘと比較信号Ｓｙから切替信号ＳＡ〜ＳＣを生成する論理演算部２４と、切替信号ＳＡ〜ＳＣに応じて基準電圧ＶｒｅｆＡ〜ＶｒｅｆＣのいずれかを基準電圧Ｖｒｅｆとして選択出力するセレクタ２２と、を有する。【選択図】図５