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基于0.18μm BCD工艺,设计了一种新型的低功耗指数补偿带隙基准。对高温段进行指数补偿,降低温漂;利用预稳压技术,引入负反馈环路以提高基准的电源电压抑制比。经过HSPICE仿真验证,基准输出电压为1.233 V,-15℃~145℃温度范围内的温度系数为3×10-6/℃;低频时电源电压抑制比为-94dB,供电电压在2.8~5V变化时,基准输出电压的线性调整率仅为0.000 5%,当供电电源为2.8V时,整体静态电流仅为3.8μA。
Based on the 0.18μm BCD process, a new low-power exponential compensated bandgap reference is designed. Exponential compensation for high temperature, reduce the temperature drift; the use of pre-regulator technology, the introduction of negative feedback loop to improve the reference power supply voltage rejection ratio. After HSPICE simulation, the reference output voltage is 1.233 V and the temperature coefficient in the range of -15 ° C to 145 ° C is 3 × 10-6 / ° C. The supply voltage rejection ratio is -94dB at low frequencies and the supply voltage varies from 2.8V to 5V , The linear regulation of the reference output voltage is only 0.0005%, when the power supply is 2.8V, the overall quiescent current is only 3.8μA.