一种采用斩波调制的高精度带隙基准源的设计  

Design of High Precision Bandgap Voltage Reference with Chopped Modulator

作　　者：杨晓春[1] 于奇[1] 宋文青[1] 董铸祥[1] 郑志威[1] 

机构地区：[1]电子科技大学电子薄膜与集成器件国家重点实验室,四川成都610054

出　　处：《微电子学与计算机》2013年第1期86-89,共4页Microelectronics & Computer

基　　金：中央高校基本科研业务费专项资金(ZYGX2010J040)

摘　　要：为了抑制运算放大器的输入失调电压对带隙基准源的影响,提高输出电压的精度,基于斩波调制技术,设计了一种高精度带隙基准源电路.通过0.25μm BiCMOS工艺模型仿真验证,结果表明,运算放大器的差分输入对管的失配为±2%时,该基准源的输出电压波动峰峰值为0.38mV,与传统带隙基准源相比,相对精度提高了113倍.当电源电压在2.5～6.0V内,基准电压源的波动小于0.085mV,温度为-40～125℃时,电路的温度系数为19ppm/℃.A high precision bandgap voltage reference with chopped modulator is presented in this paper.The chopper modulator is used to compensate the Random error caused by the offset of the opamp and improve the accuracy of the bandgap refrence.In the 0.25 μm BiCMOS models,Results from simulation showed that,Considering ±2% mismatch of input pairs respectively,the peak-to-peak value of the output ripple is 0.38 mV.The relative accuracy is increased by 113 times compared with the traditional bandgap voltage reference.With supply voltage range from 2.5 V to 6.0 V,the variation of the output is approximately 0.085 mV.In the temperature range from -40℃ to 125℃,the bandgap voltage reference had a temperature coefficient of 19 ppm/℃.

关 键 词：斩波调制 带隙基准 失调电压 不匹配 

分 类 号：TN432[电子电信—微电子学与固体电子学]