一种采用高阶曲率补偿的带隙基准源

A bandgap reference source with higher-order curvature compensation

基于0.18μm BCD工艺,提出了一种具有较低温度系数的高阶曲率补偿带隙基准源。在基本Kuijk带隙基准的结构基础上,利用VBE线性化法来进行高阶曲率补偿,同时保证流过补偿双极晶体管的电流也得到高阶补偿,两次高阶补偿使得带隙基准源的温度系数更低。根据仿真结果,该带隙基准电压在-55°C~125°C温度范围内,输出电压的最大压差为0.3766 mV,温度系数为1.762 ppm/°C,低频时电源抑制比(PSRR)为-73.9 dB。该带隙基准源已应用于某一高精度的低压差线性稳压器(LDO)中。

Based on the 0.18μm BCD process,a higher-order curvature compensation bandgap reference with low temperature coefficient is proposed.On the basis of the basic Kuijk bandgap reference structure,the VBE linearization method is used to perform high-order curvature compensation,while ensuring that the current flowing through the compensating bipolar transistor is also compensated for higher-order.The two higher-order compensations make the temperature coefficient of the bandgap reference source lower.According to simulation results,the bandgap reference voltage has a maximum voltage difference of 0.3766 mV over a temperature range of−55°C~125°C,a temperature coefficient of 1.762 ppm/°C,and a power supply rejection ratio(PSRR)of−73.9 dB at low frequencies.This bandgap reference source has been applied in a high-precision low-dropout linear regulator(LDO).