摘要
本文介绍了一种基于开关电容的带隙基准芯片电路.本文巧妙地利用电容和开关的模拟电阻,实现了静态电流小,温度系数好的开关型基准电压.同时运用自动调零技术,克服了线性基准的失调缺陷,消除了运放的失调电压,提高了输出电压的失调精度.电路在0.5μm VIS CMOS工艺下实现,温度系数29×10-6V/℃,20mV输入失调电压下的电压漂移仅为0.4mV.
A bandgap reference circuit based on switched capacitor is presented in this paper. It uses cleverly equivalent resistor of capacitor and switch to reach a low quiescent current and a well temperature coefficient. And the technology of auto-zero is used to overcome the offset disadvantage of linear reference and cancel the offset voltage of amplifier. So the offset precision of out- put voltage can be improved. The circuit was designed and implemented in 0.5μm CMOS technology. The temperature coefficient is around 29ppm/℃, while the reference voltage variation is only 0.4mv with a 20mv input offset voltage.
出处
《电子学报》
EI
CAS
CSCD
北大核心
2008年第11期2251-2255,共5页
Acta Electronica Sinica
基金
教育部超高速电路与电磁兼容重点实验室专项资助(No.YZCB2008007)
关键词
带隙基准
开关电容
自动调零
消除失调
bandgap reference
switched capacitor
auto-zero
offset cancellation
