电源学报

一种宽带宽高PSR的无片外电容LDO

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卢振贤 ¹^,² , 宋树祥 ¹^,² , 蔡超波 ¹^,²

电源学报 | 电力电子变换器拓扑 2026,24(7): 71-80

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电源学报 |电力电子变换器拓扑 2026 , 24 (7) : 71 -80

一种宽带宽高PSR的无片外电容LDO

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卢振贤¹^,², 宋树祥¹^,², 蔡超波¹^,²

作者信息

^1.广西师范大学电子与信息工程学院，广西类脑计算与智能芯片重点实验室，桂林　541004

^2.广西师范大学电子与信息工程学院，广西高校集成电路与微系统重点实验室，桂林　541004

通讯作者:

蔡超波（1987—　），男，通信作者，硕士，讲师。研究方向：模拟集成电路设计。E-mail：caichaobo@gxnu.edu.cn。

作者简介:

卢振贤（1998—　），男，硕士。研究方向：模拟集成电路设计。E-mail：jakey_lou@qq.com。

宋树祥（1970—　），男，博士，教授。研究方向：模拟集成电路设计。E-mail：songshuxiang@mailbox.gxnu.edu.cn。

A Wideband High-PSR Capacitorless LDO

Zhenxian LU¹^,², Shuxiang SONG¹^,², Chaobo CAI¹^,²

Affiliations

^1.Guangxi Key Laboratory of Brain-inspired Computing and Intelligent Chips, School of Electronic and Information Engineering, Guangxi Normal University, Guilin 541004, China

^2.Key Laboratory of Integrated Circuits and Microsystems, School of Electronic and Information Engineering, Guangxi Normal University, Guilin 541004, China

出版时间: 2026-07-30 doi: 10.13234/j.issn.2095-2805.2026.7.71

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摘要

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针对传统的无片外电容低压差线性稳压器LDO（low-dropout regulator）在中、高频率范围内工作时电源抑制PSR（power supply rejection）特性较差的问题，提出了一种具有低通滤波器的嵌入式前馈纹波抵消EFFRC（embedded feedforward ripple cancellation）技术。通过在级联翻转电压跟随器中嵌入自适应偏置的超级源随器来驱动功率晶体管，并采用米勒补偿以及前馈电容补偿方式，以确保系统稳定性并扩宽LDO整体环路带宽。此外，将低通滤波器内嵌至缓冲器中，在不消耗额外功耗的情况下实现了LDO输出端电源纹波相互抵消，从而提高了LDO的PSR频率特性。该LDO基于SMIC 130 nm CMOS工艺设计实现，仿真测试表明在0~50 mA的负载变化下，低频PSR数值均达到90 dB，PSR的频率带宽超过10 MHz，并且中频段PSR最大可以实现12 dB的提升。良好的PSR特性表明该LDO对于输入电压的不同频率噪声具有较好的动态抑制能力，因此可为其驱动的电路（如高性能模数转换器、低噪声放大器）提供干净的电源电压。

关键词

低压差线性稳压器 / 无片外电容 / 电源抑制比 / 嵌入式前馈纹波抵消

Abstract

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An embedded feedforward ripple cancellation (EFFRC) technology with a low-pass filter is proposed to address the issue of poor power supply rejection (PSR) performance in traditional output-capacitorless low-dropout regulator (LDO) operating in the medium and high frequency range. Firstly, an adaptive bias super source follower is inserted into a cascaded flipped voltage followers to drive the power transistor, and Miller compensation and feedforward capacitance compensation techniques are employed to ensure system stability and widen the LDO loop bandwidth. Additionally, a dedicated low-pass filter is integrated into the buffer to effectively eliminate power ripples at the LDO output without consuming additional power, thereby significantly enhancing PSR frequency characteristics. The designed LDO is implemented using SMIC130 nm CMOS process. Simulation results demonstrate that it achieves a low-frequency PSR value of 90 dB across a load change ranging from 0 to 50 mA. Furthermore, the PSR exhibits a frequency bandwidth exceeding 10 MHz, with potential improvements of up to 12 dB in the mid-frequency band. The good PSR characteristics show that the LDO has good dynamic suppression ability for different-frequency noise of input voltage, so it can provide a clean power supply voltage for the circuit driven by it, such as high-performance analog-to-digital converters and low-noise amplifier.

Key words

Low-dropout regulator / output-capacitorless / power supply rejection / embedded feedforward ripple cancellation

引用本文

卢振贤, 宋树祥, 蔡超波. 一种宽带宽高PSR的无片外电容LDO. 电源学报, 2026 , 24 (7) : 71 -80 . DOI: 10.13234/j.issn.2095-2805.2026.7.71

Zhenxian LU, Shuxiang SONG, Chaobo CAI. A Wideband High-PSR Capacitorless LDO[J]. Journal of Power Supply, 2026 , 24 (7) : 71 -80 . DOI: 10.13234/j.issn.2095-2805.2026.7.71

基金

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国家自然科学基金资助项目(62061005)
广西自然科学基金资助项目(2022GXNSFBA035646)

参考文献

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参考文献引证文献

排序方式：

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2026年第24卷第7期

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文章信息

doi: 10.13234/j.issn.2095-2805.2026.7.71

接收时间：2024-05-20
首发时间：2026-10-29
出版时间：2026-07-30

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出版历史

收稿日期：2024-05-20
修回日期：2024-08-07
录用日期：2024-08-27

基金

Natural Science Foundation of China(62061005)

国家自然科学基金资助项目(62061005)

Guangxi Natural Science Foundation(2022GXNSFBA035646)

广西自然科学基金资助项目(2022GXNSFBA035646)

作者信息

^1.广西师范大学电子与信息工程学院，广西类脑计算与智能芯片重点实验室，桂林　541004

^2.广西师范大学电子与信息工程学院，广西高校集成电路与微系统重点实验室，桂林　541004

通讯作者:

蔡超波（1987—　），男，通信作者，硕士，讲师。研究方向：模拟集成电路设计。E-mail：caichaobo@gxnu.edu.cn。

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https://castjournals.cast.org.cn/joweb/dyxb/CN/10.13234/j.issn.2095-2805.2026.7.71

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2种不同金属材料的力学参数

科 Family	属数 Number of genus	种数 Number of species	占总种数比例 Percentage of total species (%)	属 Genus	种数 Number of species	占总种数比例 Percentage of total species (%)
鹅膏菌科Amanitaceae	2	11	5.26	鹅膏菌属 Amanita	10	4.78
小菇科 Mycenaceae	2	12	5.74	丝盖伞属 Inocybe	5	2.39
多孔菌科 Polyporaceae	8	14	6.70	蜡蘑属 Laccaria	5	2.39
红菇科 Russulaceae	3	23	11.00	小皮伞属 Marasmius	6	2.87
				小菇属 Mycena	11	5.26
				光柄菇属 Pluteus	5	2.39
				红菇属 Russula	17	8.13
				栓菌属 Trametes	5	2.39

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