高精度低功耗快速启动带隙基准电路设计

High accuracy low power fast set-up bandgap reference circuit design

提出一种能够明显减小电流失配误差的新颖带隙基准核心结构,结合低功耗设计方法和一种全新的启动方式,实现了整个带隙基准电路超低功耗和快速启动的功能.基于JAZZ BCD 0.5μm工艺库模型,采用Spectre仿真器进行了仿真验证,结果显示,在电源电压VCC工作范围2.5～6.0 V内,带隙电压的变化为0.06mV;在VCC=3.6 V,温度范围为-25～100℃时,带隙电压精度为17.5μV/℃;典型工作状态下（VCC=3.6V,t=25℃）,整个电路静态电流仅为3.71μA,启动时间为23μs.

A novel bandgap reference core circuit which alleviates current-mirror mismatch error distinctly is proposed. With help of low power design technique and a unique start-up technique, a bandgap reference circuit with ultra-low power consumption and fast start-up time is designed. Implemented JAZZ BCD 0.5 μm technology and simulated with Spectre, it shows the output bandgap reference voltage with a variation of 0.06 mV over a power supply range from 2.5 V to 6.0 V. With the power supply 3.6 V and temperature range from --25 ℃ to 100 ℃, the accuracy of the reference voltage is 17.5μV/℃. On typical working conditions, the proposed circuit consumes only a supply current of 3.71μA, and the start-up time is 23 μs.