应用于便携式ECG的低耗能高精度带隙基准电路设计

Design of low-power consumption and high-precision bandgap reference circuit applicable for portable ECG monitoring device

为满足便携心电监测设备中低功耗的应用要求,设计一种应用于便携式心电监测芯片的具有低功耗和高精度特性的带隙基准电路。通过采用工作于亚阈值区域的CMOS晶体管,电路取得了超低功耗。并采用高阶温度曲线补偿技术,提高了电路输出基准电压的精准度。电路采用标准CMOS 180 nm工艺设计,仿真结果表明,在-40～100℃的温度范围内输出基准电压为1.16 V,温度系数约为3.3 ppm/℃,在1.3 V电源电压下功耗为6.2μW。

A low-power consumption and high-precision bandgap reference circuit applicable for the ECG monitoring chip is designed to meet the low-power consumption application requirement of the portable ECG monitoring device. The ultra-low-power consumption is achieved for the circuit by adopting the CMOS transistor working in the sub-threshold region. The high-order temperature curve compensation technique is adopted to improve the accuracy of the reference voltage output by the circuit. The standard CMOS 180 nm process design is adopted for the circuit. The simulation results show that the output reference voltage is 1.16 V and the temperature coefficient is about 3.3 ppm/℃ in the temperature range of -40~100℃,and the power consumption of the circuit is 6.2 μW at the power supply voltage of 1.3 V.