一种用于LDO的低功耗带隙基准电压源

A low power bandgap voltage reference for Low Dropout Regulator

摘要:

设计了一种应用于低压差线性稳压器(LDO)的低功耗带隙基准电压源电路。一方面，通过将电路中运放的输入对管偏置在亚阈值区，大大降低了运放的功耗；另一方面，采用零功耗的启动电路，进一步降低了整体电路的功耗。该基准电压源采用旺宏0.35 μm CMOS工艺流片，经测试，基准输出电压的温度系数为33 ppm/℃，总电流消耗仅为12 μA。

Abstract:

A low power bandgap voltage reference circuit for Low Dropout Regulator(LDO) is proposed. The power consumption is effectively decreased by setting the differential input pair of the amplifier into sub-threshold region and by using a zero power start-up circuit. The bandgap voltage reference circuit is implemented by MIXIC’s 0.35 μm CMOS process. The results indicate that the temperature coefficient of the output voltage is 33 ppm/℃, and the total current consumption is 12 μA only.