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標題: | 應用於生醫訊號偵測系統之低功耗前端電路 A low power Analog Front-end for Bio-signal Monitoring System Application |
作者: | Shun-Tung Lu 陸舜東 |
指導教授: | 呂學士 |
關鍵字: | 低電壓,低功耗,低雜訊,心電訊號,類比前端電路, low power,low noise,analog front-end, |
出版年 : | 2012 |
學位: | 碩士 |
摘要: | 由於患有慢性疾病的患者越來越多以及老年化社會的來臨,現代社會對於個 人化遠距醫療照護的需求也越來越高。幸運的是,隨著半導體產業的快速發展以 及積體電路設計產業逐漸的成熟,用來感測及監測生理訊號的生物醫學晶片得以 被實現。開發一個無線生醫訊號偵測系統晶片來實現遠距醫療照護的服務是可行 的。這不僅能幫助人們預防得到疾病還能促進人們的健康,進而增進生活的品質。 根據衛生署所頒佈的資料,心血管疾病是國人的十大死因之一。因此,一個可以 應用在遠距醫療照護服務的心電訊號監測系統對於現今社會是有其需要的。為了 要實現一個心電訊號監測系統,處理類比生理訊號的類比前端電路在系統裡是扮 演關鍵性的電路區塊。本論文提出了兩種低功耗低雜訊的類比前端電路用來降低 雜訊的干擾以及提供多種放大倍率的選擇。兩個類比前端電路皆使用 TSMC 0.18μm 的製程技術來完成高性能的生物醫學晶片。
本論文所提出的第一種前端電路是電流回授式儀表放大器以及可程式增益 放大器。藉由斬斷技術,電流回授式儀表放大器的輸入相關雜訊為 90nV/ Hz , 而整個類比前端電路的輸入相關雜訊則是 1uV/ Hz 。為了要符合各種心電訊 號大小的偵測,此電路提供了從 36dB 到 54dB 各種不同的增益選擇。此類比 前端電路在 1V 的供應電壓下只消耗了 6uW。 第二,本論文提出了一個類比前端電路以及脈衝寬度調變電路。脈衝寬度調 變電路是做為類比前端電路及數位訊號處理電路之間的介面電路。此類比前端電 路的輸入相關雜訊為 80nV/ Hz 。此外,本電路不僅提供四種從 30dB 到 50dB 不同的增益選擇,並且具有很高的輸出訊號擺幅。基於 1V 的供應電壓下,此 類比前端電路消耗了 8uW 而脈衝寬度調變電路則消耗了 5uW。 With the growing pains suffered from chronic disease and the coming of aging society, there is a highly demand on personal telehealth systems. Fortunately, due to the dramatic development of semiconductor technology and the IC design industries, biomedical chips can be developed for sensing and monitoring bio-signals. It is possible for us to develop a wireless bio-signal monitoring SoC to realize telehealth service. It not only help people prevent illness in advance but also benefit their health that would increase their quality of life. According to the information that announced by the Department of Health, cardiac disease is one of the leading causes of death. Therefore, a wireless ECG monitoring system for personal telehealth service is needed. To realize an ECG monitoring system, the analog front-end is a critical circuit block with the function of signal arrangement in the system. In this thesis, two kinds of low power and low noise analog front-end are proposed to lower the noise interference and provide a multiple gain selection. Both of the analog front-end based on the TSMC 0.18μm technology are proposed to realize high performance biomedical ICs. First, a current feedback instrumentation amplifier with a programmable gain amplifier for ECG signal detecting is proposed. By using chopper technique, the input-referred noise of CBIA is 90nV/ Hz and the overall AFE is 1uV/ Hz . It provides several gain selections from 36dB to 54dB to meet the requirement for ECG signal detecting. The analog front-end only consumes 6uW based on the 1V voltage supply. Second, an analog front-end with pulse-width modulation circuit is proposed. The pulse-width modulation circuit acts as an interface between analog front-end and digital signal processing circuit. The input-referred noise of the analog-front end is 80nV/ Hz . Besides, it not only provides four gain selections from 30dB to 50dB, but also has high output swing. Based on the 1V voltage supply, the analog front-end consumes 8uW and the pulse-width modulation circuit consumes 5uW. |
URI: | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/6560 |
全文授權: | 同意授權(全球公開) |
顯示於系所單位: | 電子工程學研究所 |
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