應用於生醫系統之低壓降穩壓器(LDO)設計

Design of LDO (Low Drop-out Regulator) for Biomedical application

周訓仰(Shvian Yang Chou)

指導教授 ： 薛木添

國立中央大學/資訊電機學院/電機工程研究所碩士在職專班/碩士(2015年)

摘要

摘要
近年來生醫系統及超大型積體電路的快速發展，使得人體內植入式或者可攜式醫療電子設備方面應用的晶片電路有愈微小的驅勢，因此低功率高效能成為可攜式電子產品的首要考量。
特別是高資料傳輸速率的植入式晶片，如人工電子耳、人工視網模輔具等，藉由無線傳輸做為電感耦合效應方式來傳輸電源與控制晶片的訊號，可避免線式的傷口感染及電池式(半侵入式)電源耗損需開刀將電池拿出替換等情形。
系統中，前端是採用電感式耦合效應 (無線傳輸方式)來傳輸電源及高資料量，因此傳輸電源中含有載頻的交流信號，交流信號可經由全波整流器轉換成直流信號，再運用低壓降穩壓器(Low Drop-out Regulator, LDO)之特性，達到輸出直流電壓穩定與降低電源雜訊干擾之效果。
此篇論文電路架構採用P-Channel MOSFET做為LDO的調節傳輸元件(Pass element)輸出穩定1.8V的低壓降穩壓系統且產生輸出1mA 0.1或1mA電流驅動負載，分別給予推挽式電路及其他補償式電路。此低壓降線性穩壓器採用 'cic018.1' 模擬製程進行模擬實現。

關鍵字

低壓降穩壓器

並列摘要

Abstract
In recent years , with the rapid development in the Biomedical system and VLSI, the chip circuit applied to medical electronic equipment, not only the implanting types but also the portable ones, has become tinier and tinier.Therefore, low power consumption or power efficiency enhancement is the main concern when designing these portable electronics.
Especially for the implanting chip of high data-rate transmission, such as the cochlear systems, retinal prostheses, by using wireless transmission, the inductive coupling effect can transmit signals of supplying power and controling the chip, which can prevent wound infection and the regular replacement of the half-invading battery by sugery.
In the system, the inductive coupling effect is adopted at the front end to transmit powers and High Data. Therefore, the power contains the AC signal of carrier frequency. The AC signal then can be converted to the DC signal via the full-wave rectifier. Accordingly, as the characteristics of Low Drop-out Regulator(LDO), it stabilizes the output of the DC signal and reduces the power supply ripples.
The circuit structure in this thesis adopts P-Channel MOSFET, an adjustment pass element, to regulate the LDO. Moreover,it enables the Low Dropout regulation system to stabilize at 1.8V and produces load current which is between 0.1mA or 1mA. It also includes push-pull output circuit and other compensating type circuit separately. Besides, the Low Dropout linear regulator undergoes the simulation of 'cic018.l' process.

並列關鍵字

Low Drop-out Regulator

參考文獻

[3] 秋展毅、魏慶隆,“ On the Implemention of an Ultra–Wide-Load High-Efficient DC-DC Buck Converter”,Taiwan,July,2011.

[6] 陳建成,” A High Efficiency Current Mode Control DC-DC Buck Converter” 國立中央大學, 電機工程學系, 碩士論文, 11月. 民國99年

[5] 陳彤伊,“Analysis and Design of an Efficient Front-End Circuitry for Wirelessly-Powered HF-Band Implantable system ” 國立中央大學, 電機工程學系, 碩士論文, 七月. 民國96年

[8] Xuewen Wang , Fengge Wang , Zhongwei Li,“The Analysis of LDO and the Stability of Loop Compensation”, Institute of Microelectronics, School of Information and Technology Northwest University Xi’an, China,2010 IEEE.

[1] Yung-Hsin Lin、Kuo-Lin Zheng、Ke-Horng Chen, ”Power MOSFET Array in LDO