LDO design for fast response of wide power supply voltage

JIU Nai-xia; WANG Li-xin

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LDO design for fast response of wide power supply voltage

更新时间：2026-09-04

- LDO design for fast response of wide power supply voltage
- Vol. 37, Issue 3, Pages: 20-25(2020)
- 作者机构：
  
  1. 中国科学院机构微电子研究所,北京,100029
  2. 中国科学院大学机构,北京,101408
- 作者简介：
- 基金信息：
- DOI：
  CLC：
- Published：2020
- 稿件说明：
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酒耐霞, 王立新. 一种宽电源电压快速响应的LDO设计[J]. 微电子学与计算机, 2020, 37(3): 20-25.

JIU Nai-xia, WANG Li-xin. LDO design for fast response of wide power supply voltage[J]. 2020, 37(3): 20-25.
酒耐霞, 王立新. 一种宽电源电压快速响应的LDO设计[J]. 微电子学与计算机, 2020, 37(3): 20-25. DOI：

JIU Nai-xia, WANG Li-xin. LDO design for fast response of wide power supply voltage[J]. 2020, 37(3): 20-25. DOI：

摘要

基于0.35 μm工艺，设计了一种工作在15~30 V的宽电源电压的高电源抑制比(PSRR)、快速瞬态响应的线性LDO.该LDO主要包含电源电压预调节模块、基准源模块、误差放大器模块.电源电压预调节模块，降低输入电压波动范围，同时采用了PSRR增强电路，提高LDO的线性稳定性和PSRR；误差放大器模块，采用了一种带正反馈增益增强差分放大器电路，提高了电路的增益，同时采用双环反馈技术，提高LDO的瞬态响应速度.仿真结果表明：输出电压为5 V，PSRR低频时为128 dB，100 kHz时为60 dB，瞬态响应时间约为0.1 s.

Abstract

Based on the 0.35 μm process

a high power supply rejection ratio (PSRR) and fast transient response linear LDO was designed.The LDO consists of a power supply voltage pre-regulation module

a reference source module and an error amplifier module.The power supply voltage pre-regulation module reduces the input voltage fluctuation range. Meanwhile

PSRR enhancement circuit is adopted to improve the linear stability of LDO and PSRR.The error amplifier module adopts a differential amplifier circuit with positive feedback gain to improve the gain of the circuit

and at the same time adopts double-loop feedback technology to improve the transient response speed of LDO.Simulation results show that the output voltage is 5 V

the PSRR low frequency is 128 dB

100 kHz is 60 dB

and the transient response time is about 0.1 s.

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Keywords

references

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