CMOS低壓降線性穩壓器的設計與實作
Design and Implementation of the CMOS Low-Dropout Linear Regulators
Date Issued
2005
Date
2005
Author(s)
Lu, Sao-Hung
DOI
en-US
Abstract
With the larger demand for low-power portable battery-operated electronic devices, there is a growing trend toward lower power consumption to increase the battery life. The low-dropout (LDO) linear regulator is widely used in power management since it has a better load transient response, less output noise and ripples, and few off-chip components. However, there are some tradeoffs among the stability of conventional linear regulators and other performances such as the transient response, maximum load current, current efficiency, and accuracy of the output voltage, etc. Hence, this chapter provides some kinds of different methods to improve the load transient response and maintain the stability simultaneously.
First, we will introduce some terms, definitions, fundamental concepts about the LDO linear regulator. In addition, some considerations and tradeoffs for designing the LDO linear regulator are described to understand the design of the LDO linear regulator more thoroughly. Next, we propose a fast-settling LDO linear regulator with single Miller compensation capacitor. The proposed LDO linear regulator can fast recover to its nominal value for the output capacitors with low and high equivalent series resistance (ESR) by utilizing the digital-controlled dynamic bias circuit as the output load current is switched from 0 to 150mA. However, an additional off-chip output capacitor constraints the application of System-on-Chip (SoC). Therefore, we present a newly designed LDO linear regulator for any output capacitor. The dips of the output voltage can be improved obviously by the use of the slew rate enhancement (SRE) circuit as the output load current is switched from 0 to 150mA. Finally, we use the bandwidth extension skill to improve the output transient response for the output load current variation. By the bandwidth-extension skill, the value of the Miller compensation capacitor is reduced very much. In addition, the dips, peaks and settling time of the output voltage for the load transient response are improved simultaneously by the use of the bandwidth extension skill.
Subjects
低壓降線性穩壓器
線性穩壓器
頻率補償
LDO linear regulator
linear regulator
frequency compensation
Type
thesis
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