在传统Brokaw带隙基准源的基础上,提出一种采用自偏置结构和共源共栅电流镜的低成本多路基准电压输出的CMOS带隙基准源结构,省去了一个放大器,并减小了所需的电阻阻值,大大降低了成本,减小了功耗和噪声.该设计基于华虹1 μm的CMOS工艺,进行了设计与仿真实现.Cadence仿真结果表明,在-40～140℃的温度范围内,温度系数为23.6 ppm/℃,静态电流为24μA,并且能够产生精确的3V,2V,1V和0.15V基准电压,启动速度快,能够满足大多数开关电源的设计需求与应用.%Based on the traditional Brakaw bandgap reference source, a CMOS bandgap reference source structure of low-cost multi-path reference voltage output is presented, which adopts a self-biased structure and cascode current mirror instead of an amplifier. It decreases the demands of the resistance value, and reduces the cost, power consumption and noise greatly. The circuit was implemented with Hua Hong lμm CMOS technology. Cadence simulation results show that its temperature coefficient is 23. 6 ppm/℃ and the quiescent current is 24 μA at the range of - 40~140℃ , it can generate accurate reference vultages of 3 V, 2 V, 1 V and 0.15 V, has a advantage of fast start-up, and meets the design requirements of the most switching power supplies.
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