一种宽电源范围高电源抑制比的LDO设计  

LDO design for wide power supply range and high PSRR

作　　者：沈俊杰 张瑛[1] 陈德媛[1] 熊天宇 罗寅 SHEN Junjie;ZHANG Ying;CHEN Deyuan;XIONG Tianyu;LUO Yin(College of Integrated Circuit Science and Engineering(College of Industry-Education Integration),Nanjing University of Posts and Telecommunications,Nanjing 210023,China;Suzhou Convert Semiconductor Inc.,Suzhou 215600,China)

机构地区：[1]南京邮电大学集成电路科学与工程学院(产教融合学院),江苏南京210023 [2]苏州锴威特半导体股份有限公司,江苏苏州215600

出　　处：《微电子学与计算机》2024年第12期120-131,共12页Microelectronics & Computer

基　　金：国家自然科学基金(61971240)。

摘　　要：针对工业及汽车电子等领域对输入电压范围、电源噪声抑制能力要求较高的应用场景,设计了一种宽电源范围、高电源抑制比(Power Supply Rejection Ratio,PSRR)的低压差线性稳压器(Low Dropout Linear Regulator,LDO)。提出了一种新型高压预稳压电路,通过负反馈电流以及三极管共源共栅交叉耦合结构,改善了内部低压电源(LV_AVDD)线性调整率以及温漂等性能。同时,通过预稳压电路进一步提高了LDO的PSRR。基于0.18μm BCD工艺完成了高压预稳压模块以及LDO环路模块的整体电路搭建,实验结果表明:当电源电压范围为10~40V、温度范围为-40~125℃时,LV_AVDD输出5.574 V,温漂为1.358×10^(-5)℃^(-1),线性调整率为0.763 mV/V;LDO输出电压为3.325 V,低频电源抑制比达到-120.1 dB。To meet strict requirements which need high voltage input range and power supply noise rejection ability in industrial and automotive electronics fields,a Low Dropout Linear Regulator(LDO)with wide power supply range and high Power Supply Rejection Ratio(PSRR)is designed.A new type of high voltage pre-regulation circuit is proposed,which improves the linear regulation and temperature drift of internal low voltage power supply(LV_AVDD)by using the negative feedback current and Cascode Cross-Coupled BJT structure.At the same time,the PSRR of LDO is further improved by the pre-regulation circuit.The whole circuit is composed of high voltage pre-regulation module and LDO loop module,and is designed based on 0.18μm BCD process.Simulation results show that when the input power supply range is 10-40 V and the temperature range is-40-125℃,the output of LV_AVDD is 5.574 V,the temperature coefficient is 1.358×10^(-5)℃^(-1),the linear regulation is 0.763 mV/V.The LDO output voltage is 3.325 V,and the low frequency PSRR reaches-120.1 dB.

关 键 词：宽电源范围 高电源抑制比 低压差线性稳压器 预稳压电路 负反馈 交叉耦合结构 

分 类 号：TN433[电子电信—微电子学与固体电子学]