0.6V低功耗数字LDO：快速响应与自适应电流步进控制
159 浏览量
更新于2024-08-27
收藏 889KB PDF 举报
本文介绍了一种高性能的0.6伏100毫安全集成数字低压差分调节器(DLDO)，它采用了创新的自适应电流步进大小控制技术。设计的关键在于对主电源场效应晶体管(MOSFET)进行了细分，将其划分为十个具有不同单元尺寸的区块。这样，当负载轻时，小功率的MOSFET可以被快速切换开启或关闭，而在负载重的情况下，则启用大功率MOSFET，从而实现了宽负载范围内的高精度调节以及快速的瞬态响应。
为了进一步提升性能，设计中引入了一个辅助电源MOS结构，它包含PMOS和NMOS晶体管。这个额外的组件在轻载条件下有助于消除限环振荡(LCO)，确保系统的稳定运行。此外，这种设计还利用了快速响应的优势，使得系统能够迅速适应负载变化，提高了整体效率。
该DLDO采用的是65纳米低功耗CMOS工艺技术，这确保了在低电压和低功耗应用中的高效能表现。通过集成数字控制技术，电路能够实时监控和调整电流，以达到精确的电压调节和最小的动态响应时间。这种设计对于现代电子设备中的电源管理至关重要，尤其是在需要快速响应和高效率的微型化电子系统中，如物联网(IoT)设备、移动通信设备和嵌入式系统。
这项研究论文展示了如何通过精细的电路设计和自适应控制策略，实现一个高性能、低功耗且瞬态响应快速的全集成数字LDO，这对于推动电子设备的能源管理和性能优化具有显著的意义。
A Fast-Transient-Response Fully-Integrated Digital
LDO with Adaptive Current Step Size Control
Guigang Cai
1,2
, Chenchang Zhan
1
and Yan Lu
2
1
Department of Electrical and Electronic Engineering, Southern University of Science and Technology, Shenzhen, China
2
The State Key Laboratory of Analog and Mixed-Signal VLSI, University of Macau, Macau, China
Email: caigg@mail.sustc.edu.cn, zhancc@sustc.edu.cn, yanlu@um.edu.mo
Abstract—A 0.6-V 100-mA fully-integrated digital low-
dropout regulator (DLDO) with adaptive current step size control
is presented in this paper. By dividing the main power PMOSs into
ten blocks with different unit-cell sizes, the proposed DLDO can
turn-on/-off small power PMOSs in light load and large ones in
heavy load conditions. High regulation accuracy in a wide load
range and fast transient response are hence achieved. In addition,
an auxiliary power MOS block, which consists of both PMOS and
NMOS transistors, is adopted to eliminate the limit cycle
oscillation (LCO) in light load condition and to further accelerate
the response speed. The proposed DLDO is fabricated in a 65-nm
low-power CMOS technology with an active area of 0.17 mm
2
including an on-chip output capacitor of 1nF. The measured
undershoot and overshoot voltages are only 53 mV and 37 mV,
respectively, when the load current changes between 0 and 100 mA.
The quiescent current is 34.6 μA, while the maximum current
efficiency is 99.96%.
Keywords—digital low-dropout regulator (DLDO), adaptive
current step size control, wide load range, fully-integrated, fast
transient response.
I. INTRODUCTION
Low-dropout regulators (LDOs) are widely used in system-
on-a-chip (SoC) designs for its small voltage ripple, fast
transient response, small area requirement and low cost.
Recently, energy-efficient digital circuits are designed with
near-/sub-threshold supply voltage to reduce the power
consumption. However, low supply voltage brings design
challenges to the traditional analog LDO (ALDO) that consists
of analog amplifiers. Meanwhile, shrinking the channel length
and gate-oxide thickness in advanced CMOS technology
greatly increases the design difficulty of analog circuits.
Therefore, digital LDO (DLDO) was proposed to be an
alternative solution [1], and has attracted enormous attentions.
However, many existing DLDOs suffer from a limited load
current range [1-4], or demand a large decoupling capacitor [5-
6], limiting their applications. Techniques such as reduced
dynamic stability [2], event-driven control [4] and burst mode
technique [5] have been proposed to improve the transient
response, but the effects are not optimal. The analog-assisted
loop scheme in [7] reduces the output variation when the load
current changes from 2 to 12 mA, but is not very effective for a
small initial load current.
In this paper, we present a fully-integrated DLDO with
adaptive current step size control. It achieves wide load range,
good regulation accuracy and fast transient response without
using large quiescent current. In addition, the limit cycle
oscillation (LCO) in light load is alleviated and even eliminated
without a large dead-zone. The working principle and circuit
implementation of the proposed DLDO are discussed in Section
II. Section III shows the measurement results and Section IV
draws the conclusion.
II. OPERATION PRINCIPLE AND CIRCIUT IMPLEMENTATION
A. Operation Principle
DLDO turns on/off one or more power MOSs per clock
cycle to charge/discharge the output voltage V
OUT
to make it
close to the reference voltage V
REF
. However, turning-on/-off
the same power MOS in different load conditions has different
effects on V
OUT
. Specifically, turning-on/-off small‐size power
MOSs is fine in light load but has small effect in heavy load,
which affects the regulation speed. On the other hand, turning-
on/-off large-size power MOSs is OK in heavy load but may lead
to limit cycle oscillation (LCO) and stability problems in light
load. Therefore, we propose to use adaptive power MOS sizes
per load conditions.
Fig. 1 shows the block diagram of the proposed DLDO,
which consists of 4 comparators, a control circuit, a main power
block, an auxiliary power block, and an output capacitor C
OUT
.
Among the four reference voltages, V
REF+
= V
REF
+ ΔV
1
, V
REF−
= V
REF
- ΔV
1
, V
REFH
= V
REF
+ ΔV
2
and V
REFL
= V
REF
- ΔV
2
, and
ΔV
1
< ΔV
2
. When V
OUT
runs out of the range of [V
REF−
: V
REF+
],
signal EN
1
is set to 1, otherwise EN
1
= 0. Similarly, When V
OUT
This work was in part supported by NSFC under grant 61604067, SZSTI
under grant JCYJ20170817112233337 and the Research Committee of
University of Macau under grant MYRG2018-00102-AMSV.
Control Circuit
Y1_0
F0
Y9_<0:13>
F1
F9
C
OUT
I
LOAD
V
OUT
V
REF+
V
REF−
CMP
3
V
REFH
V
REFL
CMP
4
CMP
1
CMP
2
EN
1
EN
2
UNIT
0
Y0_<0:4>
Q
+
Q
-
Q
H
Q
L
Q
+
Y2_0
Y9_0
UNIT
9
UNIT
1
PMOS
1
Y1_<0:4>
PMOS
9
Main Power
Block
Auxiliary
Power
Block
PMOS
0
I
A
I
M
Fig. 1 Block diagram of the proposed DLDO.
978-1-7281-0397-6/19/$31.00 ©2019 IEEE
下载后可阅读完整内容，剩余3页未读，立即下载
2021-02-08 上传
2023-03-07 上传
2021-02-08 上传
2021-02-08 上传
2022-09-24 上传
2021-02-08 上传
2021-06-02 上传
2021-05-22 上传
2021-02-08 上传
weixin_38704284
- 粉丝: 3
- 资源: 987
我的内容管理
展开
最新资源
- Angular实现MarcHayek简历展示应用教程
- Crossbow Spot最新更新 - 获取Chrome扩展新闻
- 量子管道网络优化与Python实现
- Debian系统中APT缓存维护工具的使用方法与实践
- Python模块AccessControl的Windows64位安装文件介绍
- 掌握最新*** Fisher资讯，使用Google Chrome扩展
- Ember应用程序开发流程与环境配置指南
- EZPCOpenSDK_v5.1.2_build***版本更新详情
- Postcode-Finder：利用JavaScript和Google Geocode API实现
- AWS商业交易监控器：航线行为分析与营销策略制定
- AccessControl-4.0b6压缩包详细使用教程
- Python编程实践与技巧汇总
- 使用Sikuli和Python打造颜色求解器项目
- .Net基础视频教程：掌握GDI绘图技术
- 深入理解数据结构与JavaScript实践项目
- 双子座在线裁判系统：提高编程竞赛效率
