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基于带隙基准原理,通过优化电路结构和采用BiCMOS技术,提出一种精度高、噪声小的带隙基准源电路。利用具有高开环增益的折叠式共源共栅放大器,提高了低频电压抑制比;应用低跨导PMOS对管及电路输出端低通滤波器,实现了更低的噪声输出;合理的版图设计减小了失调电压带来的影响。Hspice仿真结果表明,在3V电源电压下,输出基准电压为1.2182mV,温度系数为1.257×10-5/℃;频率从103～105 Hz变化时,输出噪声最大值的变化量小于5μV。流片测试结果表明,该基准源输出基准电压的电源抑制比高,温度系数小,噪声与功耗低。
Based on the bandgap reference principle, a bandgap reference circuit with high accuracy and low noise is proposed by optimizing the circuit structure and adopting BiCMOS technology. The use of a folded cascode amplifier with high open-loop gain improves the low-frequency voltage rejection ratio. The use of low-transconductance PMOS pairs of the low-pass filter at the output of the tube and the circuit enables lower noise output. A reasonable layout design is reduced The impact of offset voltage. Hspice simulation results show that the output voltage is 1.2182mV and the temperature coefficient is 1.257 × 10-5 / ℃ at 3V supply voltage. The variation of maximum output noise is less than 5μV when the frequency is changed from 103 ~ 105Hz. The test results show that the reference voltage output of the reference voltage power supply rejection ratio, the temperature coefficient of small, low noise and power consumption.