针对手机摄像头、蓝牙等噪声敏感电子设备的供电问题，设计了一种高电源纹波抑制比(Power Supply Rejection Ratio, PSRR )超低漏失电压的低压差线性稳压器(Low Dropout Regulator, LDO )。电路采用N型场效应晶体管(NMOS)作为调整管，通过双路电源供电，分离偏置电源与调整管输入电源，实现高PSRR与超低漏失电压。设计引入预稳压调制电路以及低通滤波器来处理基准电压，提高偏置电源的PSRR。主环路则通过反向嵌套密勒补偿调整系统零极点分布，提高电路整体的PSRR。基于0. 18μm CMOS工艺完成电路和版图的设计，电路最大负载电流为500mA，仿真结果表明，在最大负载电流下的漏失电压为100mV；在负载10mA时，100Hz、1kHz、10kHz、1MHz频率下输入电源的PSRR分别为-110dB、-90dB、-70dB、-65dB。

Addressing the power supply issues of noise-sensitive electronic devices such as mobile phone cameras and Bluetooth, a low dropout regulator (LDO) with high power supply rejection ratio (PSRR) and ultra-low dropout voltage has been designed. The circuit employs an N-type field-effect transistor (NMOS) as the regulation transistor and is powered by a dual-power supply. It segregates the bias power supply from the input power supply of the regulation transistor, thereby attaining a high Power Supply Rejection Ratio (PSRR) and an ultra-low dropout voltage. The design incorporates a pre-regulation modulation circuit and a low-pass filter to process the reference voltage, enhancing the PSRR of the bias power supply. The main loop adjust the system's pole-zero distribution through inverse nested Miller compensation, improving the overall PSRR of the circuit. The circuit and layout design were completed based on a 0.18µm CMOS process. The maximum load current of the circuit is 500mA. Simulation results show that the dropout voltage at maximum load current is 100mV. At a load of 10mA, the power supply rejection ratio (PSRR) of the input power supply at frequencies of 100Hz, 1kHz, 10kHz, and 1MHz are -110dB, -90dB, -70dB, and -65dB, respectively.