CAJ | 학술논문

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1 μA时,相位裕度为46°.电路设计基于TSMC 0.18 μm CMOS工艺,采用Hspice进行仿真,电路工作电压为1.8 V.
통과대전통LDO빈솔보상전로적영점、겁점진행분석,제출료일충신영적빈솔보상기술.재원유빈솔보상전로적기출상,증가일개전조화전용이급일개PMOS관,구성신적보상망락.차보상망락산생일조령겁점,차영점재대관범위내,겁점재대관범위외.방진결과현시,수출전류위100 mA시,상위유도위87°;수출전류위1 μA시,상위유도위46°.전로설계기우TSMC 0.18 μm CMOS공예,채용Hspice진행방진,전로공작전압위1.8 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.