李茂,
董嗣万
西安邮电大学电子工程学院 西安 710121
基金项目:国家自然科学基金(61674122，61804124)，陕西省创新人才推进计划(2017KJXX-46)，陕西省高层次人才特殊支持计划(2018-36)
详细信息
作者简介:佟星元：男，1984年生，博士后，教授，研究方向为生物医疗电子、超低功耗模拟. 混合信号集成电路设计
李茂：男，1994年生，硕士生，研究方向为电源管理及无线能量传输电路设计
董嗣万：男，1988年生，博士，讲师，研究方向为模拟集成电路设计
通讯作者:佟星元 mayxt@126.com
中图分类号:TN431.2计量
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被引次数:0
出版历程
收稿日期:2018-11-20
修回日期:2019-03-07
网络出版日期:2019-04-10
刊出日期:2019-11-01
A Capacitor-less Low Dropout Regulator with Fast Response
Xingyuan TONG,,Mao LI,
Siwan DONG
School of Electronics Engineering, Xi’an University of Posts and Telecommunications, Xi’an 710121, China
Funds:The National Natural Science Foundation of China (61674122, 61804124), Shaanxi Innovation Talents Promotion Plan(2017KJXX-46), Shaanxi Provincial High-level Talents Special Support Plan (2018-36)
摘要
摘要:为了改善负载跳变对低压差线性稳压器(LDO)的影响，该文提出一种用于无片外电容LDO(CL-LDO)的新型快速响应技术。通过增加一条额外的快速通路，实现CL-LDO的快速瞬态响应，并且能够减小LDO输出过冲和下冲的幅度。该文电路基于0.18 μm CMOS工艺设计实现，面积为0.00529 mm2。流片测试结果表明，当输入电压范围为1.5～2.5 V时，输出电压为1.194 V；当负载电流以 1 μs的上升时间和下降时间在 100 μA～10 mA之间变化时，CL-LDO的过冲恢复时间为489.537 ns，下冲恢复为960.918 ns；相比未采用该技术的传统CL-LDO，响应速度能够提高7.41倍，输出过冲和下冲的电压幅值能够分别下降35.3%和78.1%。
关键词:低压差稳压器/
无片外电容/
快速瞬态响应/
面积小
Abstract:A novel technique for increasing the load response speed of Capacitor-Less Low-DropOut linear regulator (CL-LDO) is proposed to improve the transient response of CL-LDO when its load current changes. With an additional fast signal feedback path, the CL-LDO can achieve fast transient response so that the overshoot and undershoot of its output voltage can be dramatically reduced. A CL-LDO with fast response is realized in 0.18 μm CMOS and occupies an active area of 0.00529 mm2. The CL-LDO has an output voltage of 1.194 V when the input supply voltage ranges from 1.5 V to 2.5 V. When the load current changes from 100 μA to 10 mA with the rise and fall time of 1 μs, the output of LDO can be recovered from its overshoot and undershoot to a stable voltage within 489.537 ns and 960.918 ns, respectively. Compared with a traditional CL-LDO without this proposed technique, the transient response speed of this CL-LDO is increased by 7.41 times. The overshoot and undershoot of the output voltage is decreased by 35.3% and 78.1%, respectively.
Key words:Low-DropOut (LDO) regulator/
Capacitor-less/
Fast transient response/
Small area
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