https://scholars.lib.ntu.edu.tw/handle/123456789/174307
標題: | 用於無線生醫監測系統之類比數位轉換器 ADC for Wireless Biotelemetry System |
作者: | 陳麒安 Chen, Chi-An |
關鍵字: | 無線生醫監測系統;類比數位轉換器;Wireless Biotelemetry System;ADC | 公開日期: | 2005 | 摘要: | 本論文的目的在於無線生醫監測系統之人体訊號監測器的積体電路設計,用以降低其功率損秏及其体積,進一步的使人体訊號監測器能夠使用更久更輕便,在本論文中主要在於實現適用於無線生醫監測系統之類比數位轉換器的積体電路部分,其它的部分例如射系統以及訊號放大器則使用外部模組,在實驗整個系統的穩定性及可行性之後在未來才將其它部分一起整合在單一顆積体電路中;在本論的內容中包含了基本的無線系統、無線生醫系統、心電圖的電路及其訊號、各種常見的類比數位轉換器架構及其基本特性、混合式類比數位轉換器的實現、及混合式類比、數位轉換器和生醫系統的量測及實驗,文章內容主要分成三個部分: 第一部分,了解常見之無線傳輸架構其傳輸方式及傳輸速率,在目前常用的無線系統主要為 802.11、Bluetooth、ASK、FSK,這些無線的架構其傳輸速率皆大於4.8KBPS所以皆可以用來傳輸心電圖系統因為心電圖的頻寬大約需100Hz,而為了低功率及小体積所以先選用架構較簡單的ASK及FSK,在對訊號和傳輸系統的分析和了解有了初步的了解之後,便可以進一步的依照所需要的規格設計類比數位轉換器的基本功能方塊,以做為後續電路設計的依據,其規格主要為 7位元的類比數位轉換器並操作在5.5MHz 而類比數位轉換器的並列輸出經由一個多工器(MUX)轉為串列輸,而多工器的輸(MUX)出主要符合廣用收發器(UART)的格式。 第二部分,了解各式類比數位轉換器的原理及其優缺點,由於並非所有類比數位轉換器結構可以適用於無線生醫監測系統,最後選擇出來的類比數位轉換器的結構為電容電阻混合式有效近似類比數位轉換器,並以台灣積体電路公司(TSMC)所提供的CMOS 0.35微米 2P4M製程來進行設計及模擬。 第三部分,對於所設計的積体電路進行基本的量測,經由測量之後類比數位轉換器其操作在1.5KHz1.8伏特的輸入時,其微分型非線性誤差為0.6個最小單位而積分型非線性誤差為1.3個最小單位,有效位元數為6位元;多工器在經由測試之後其工能正常,之後把此顆積体電路整合成一個監測電路之後亦可傳輸溫度及心電圖。 The purpose of this thesis is for the IC design of the wireless biotelemetry system in order to reduce the power consumption and volume. Moreover, the integrated circuit causes the wireless biotelemetry system to use longer and more convenient than hybrid system. In the thesis, the IC of ADC for wireless biotelemetry system is implemented firstly. The other part of the system is used by the module. After the stability and feasibility of the system is experimented, the RF system and amplifier will be integrated in the same chip. The concepts of this thesis include the basic RF systems, the wireless biotelemetry systems, and ECG signal; moreover, this thesis also introduces the basic architectures and properties of the ADC, the implement of Hybrid SAR ADC, and the experiments of the wireless biotelemetry system which includes the Hybrid SAR ADC. This thesis is divided into three parts: The fist part is used to understand the common architectures and the transmission rate of wireless system which is 802.11, Bluetooth, ASK, and FSK usually. The transmission rate of these wireless architectures is enough for the ECG system because the bandwidth of ECG signal is about 100Hz. In order to reduce the power consumption and volume, the ASK and FSK are chosen firstly. The function blocks are implemented for the circuit design of ADC after the understanding of transmission system. The specs of function blocks is 7bit ADC which is operated at 5.5MHz, and the ADC parallel outputs is transferred into series output which follows the UART interface by a MUX. The second part is used to understand the principles and advantages of architectures of ADC because not all the architectures are suitable to be implemented in the wireless biotelemetry systems. The Hybrid SAR ADC is chosen for the application and is designed by the TSMC CMOS 0.35um 2P4M process. In the third part, the IC is measured and the input is 1.8V 1.5 KHz. The INL is 0.6LSB, DNL is 1.3LSB, and ENOB is 6bit. The MUX works rightly, and the experiments of the temperature and ECG are presented. |
URI: | http://ntur.lib.ntu.edu.tw//handle/246246/57543 | 其他識別: | en-US |
顯示於: | 電子工程學研究所 |
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