ADC for Wireless Biotelemetry System

• Main Authors: Chi-An Chen, 陳麒安
• Other Authors: 呂學士
• Format: Others
• Language: en_US
• Published: 2005
• Online Access: http://ndltd.ncl.edu.tw/handle/71375149582042348113

碩士 === 國立臺灣大學 === 電子工程學研究所 === 93 === 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.