摘要
针对传统低压差线性稳压器(LDO)需要离片大电容的不足,基于180 nm CMOS工艺设计了一款双环快速瞬态响应的无片外电容LDO。该LDO采用极点分裂技术,以保证在不同负载电流情况下的稳定性,并通过瞬态增强电路检测输出电压的波动来为功率管栅极提供额外充、放电电路,以减小系统的过冲电压。同时,在传统模拟环路的基础上增加了数字辅助环路,以提升LDO的最大负载电流。仿真结果表明,当电源电压为1.8 V,输出电压为1.5 V,该LDO负载电流最大值为275 mA,空载静态电流为39μA。负载电流1~250 mA在1μs的时间跳变时,上冲电压为66 mV,下冲电压为77 mV。结果表明LDO的带载能力、瞬态响应性能在双环路加持下得到显著提升。
In view of the disadvantage of traditional low-voltage differential linear voltage regulator(LDO)requiring large external capacitors,a double loop fast transient response LDO circuit without external capacitors was designed based on standard CMOS technology of 180 nm.The circuit uses Miller compensation and composite transistor technology to ensure the stability of LDO under different load current conditions.This circuit uses pole splitting technology to ensure the stability of LDO under different load currents.At the same time,the transient enhancement circuit is used to detect the voltage fluctuation of the output terminal to provide additional charging and discharging circuit for the power tube grid,which reduces the upshot and downshot voltage of the LDO output terminal.In addition to the traditional analog loop,a digital loop is added to increase the maximum load current of LDO significantly.The simulation results show that when the supply voltage is 1.8 V and the output voltage is 1.5 V,the maximum load current of the LDO is 275 mA and the no-load static current is 39μA.When the load current ranges from 1 to 250 mA and the time jumps from 1μs,the upstroke voltage is 66 mV and the downstroke voltage is 77 mV.The load capacity and transient response performance are significantly improved due to the dual loop circuit.
作者
奥鹏龙
李海鸥
徐卫林
王媛
AO Penglong;LI Haiou;XU Weilin;WANG Yuan(Guangxi Key Laboratory of Microelectronic Devices and Integrated Circuits in Universities,Guilin University of Electronic Science and Technology,Guilin 541004,China;Guangxi Key Laboratory of Precision Navigation Technology and Applications,Guilin University of Electronic Science and Technology,Guilin 541004,China)
出处
《微电子学与计算机》
2024年第8期115-120,共6页
Microelectronics & Computer
基金
国家自然科学基金(62064002,62174041)
广西精密导航技术与应用重点实验室基金(DH202212)
广西研究生教育创新计划(YCSW2023305)
云南省科技重大专项计划新材料专项(202102AB080008-2)。
