一种高PSRR超低噪声CL-LDO设计  

A High PSRR Ultra-Low Noise CL-LDO Design

作　　者：姚佳 武华[1] 冯秀平 陈翰民 杨煌虹 曾伟 曹先国 YAO Jia;WU Hua;FENG Xiuping;CHEN Hanmin;YANG Huanghong;ZENG Wei;CAO Xianguo(College of Physics and Electronic Information,Gannan Normal University,Ganzhou Jiangxi 341000,China;Sichuan Xinsheng Xinguo Technology Co.,Ltd.,Chengdu Sichuan 610000,China)

机构地区：[1]赣南师范大学物理与电子信息学院,江西赣州341000 [2]四川芯盛芯国科技有限公司,四川成都610000

出　　处：《电子器件》2024年第5期1173-1180,共8页Chinese Journal of Electron Devices

基　　金：国家自然科学基金项目(61650404);江西省教育厅科技项目(GJJ201411)。

摘　　要：提出了一种高电源抑制比(PSRR)超低噪声无片外电容低压差线性稳压器(CL-LDO)。采用自偏置折叠共源共栅结构的自适应误差放大器降低系统噪声;利用过温保护电阻和电流增强电阻的基准电压源结构,使电压基准源在高工作电压下具有较高PSRR;同时在电流源正温度系数支路引入一对温度系数相反的电阻,简化电流源零温度系数调节过程。该CL-LDO基于CSMC 0.18μm BCD工艺进行电路验证,该电路在输出电容为1 pF,电源电压为4.9 V~5.2 V,负载电流为200μA至90 mA条件下,可稳定提供3.3 V电压输出,电源抑制比为-44 dB@10 kHz,等效输入噪声仅为17nV/√Hz@100kHz。电源电压5 V时具有12.1μV/mA的负载调整率和4.8 mV/V的线性调整率。阶跃负载电流上升/下降时间为1μs的情况下,该CL-LDO恢复时间小于2.2μs。A high power supply rejection ratio(PSRR)ultra-low noise,capacitor-less low dropout linear regulator(CL-LDO)is proposed.An adaptive error amplifier with a self-biasing folded cascode structure is used to reduce system noise.High PSRR at high apply voltages is provided by using the reference voltage source structure with an over-temperature protection resistor and a current enhancement resistor.The zero-temperature coefficient regulation of the current source is simplified through a pair of resistors with opposite temperature coefficients in the positive temperature coefficient branch of the current source.The CL-LDO is based on the CSMC 0.18μm BCD process and is proven to provide a stable 3.3 V output under the condition of the output capacitance being 1 pF,a supply voltage being 4.9 V-5.2 V and a load current being 200μA to 90 mA,with a supply rejection ratio of-44 dB@10 kHz and an equivalent input noise of only 17 nV/√[e-mail] load regulation rate is 12.1μV/mA and the linear regulation of 4.8 mV/V at 5 V supply voltage.The CL-LDO recovery time is less than 2.2μs when the step load current rise/fall time is 1μs.

关 键 词：无片外电容低压差线性稳压器 超低噪声 电源抑制比 负载调整率 线性调整率 

分 类 号：TN432[电子电信—微电子学与固体电子学]