一种新颖的LDO频率补偿技术  

A Novel Frequency Compensation Technique for LDO

作　　者：陈斯[1] 恽廷华 

机构地区：[1]徐州师范大学物理与电子工程学院,江苏徐州221116 [2]智迈微电子科技(上海)有限公司,上海200433

出　　处：《微电子学》2009年第6期769-772,共4页Microelectronics

基　　金：江苏省高校自然科学研究计划资助项目(08KJB140010);徐州师范大学校科研基金资助项目(06XLB04)

摘　　要：通过对传统LDO频率补偿电路的零点、极点进行分析,提出了一种新颖的频率补偿技术。在原有频率补偿电路的基础上,增加一个电阻和电容以及一个PMOS管,构成新的补偿网络。此补偿网络产生一组零极点,且零点在带宽范围内,极点在带宽范围外。仿真结果显示,输出电流为100 mA时,相位裕度为87°;输出电流为1μA时,相位裕度为46°。电路设计基于TSMC 0.18μm CMOS工艺,采用Hspice进行仿真,电路工作电压为1.8 V。By analyzing the pole-zero behavior of a traditional frequency compensation circuit for LDO, a novel technique was presented. A novel frequency-compensation circuit was realized by adding a resistor, a capacitor and a PMOS transistor to the conventional circuit. The novel circuit generated a set of zeros and poles, and the zero position was within UGB and the pole position was out of UGB. Simulation results showed that the circuit had phase margins of 87° and 46° for output currents of 100 mA and 1 μA, respectively. The circuit was designed based on TSMC＇s 0. 18-μm CMOS process and simulated using Hspice with 1.8 V power supply.

关 键 词：LDO 极点 零点 频率补偿 

分 类 号：TN43[电子电信—微电子学与固体电子学]