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/℃.
出处
《微电子学与计算机》
CSCD
北大核心
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)
关键词
斩波调制
带隙基准
失调电压
不匹配
chopper modulation
bandgap reference
offset voltage
mismatch
