Design And Implementation Of Wireless Pulse Oximetry Monitoring System Based On UHF RFID Technique

To relieve the social issues caused by population-aging and insufficient medical resources,a potential solution is to directly transfer the patient’s vital signs information to doctors and medical institutions by wearable devices and advanced communications technology,thus makes the integrated and intelligent wearable devices with features of miniaturization and wireless capability become more popular.Ultrahigh frequency radio frequency identification technology(UHF RFID)is a wireless communications technology working between the frequency range of 860-960 MHz,which has the advantages of strong anti-interference ability,low cost and power consumption.Its functionality can be further extended through a combination with advanced sensor technology.However,it has not been used in the development of wearable devices up to now.Therefore,developing the applications of wireless vital signs monitoring system based on UHF RFID technology is of great significance to promote the development of medical wisdom and the reform of the medical industry.This thesis presents a solution of wireless pulse oximetry monitoring system based on UHF RFID technique,completes the system set up and verification,and the digital integrated circuit design was accomplished.The whole system was composed of photoelectric sensor,data processing module,RFID tag,reader and host computer.The sensor initially measures the information of pulse and oxygen saturation,after that the data module processes and encodes the data,and then the health information is communicated wirelessly between RFID reader and tags.Finally,the host computer collects and real-time displays the health information.After the verification of system function,the digital IC design for the data processing module is carried out.Firstly,RTL code is written and optimized,and then the back-end physical design based UMC 0.18μm COMS technology is completed,which includes placement,clock tree synthesis,routing and design for manufacturability.After the static timing analysis,formal verification,physical verification DRC and LVS checks,the timing violations and the layout problems are solved finally.The layout area of data processing chip is 693×693μm~2,and the number of standard cells is 1704.The experimental results showed that our monitoring system can accurately collect the health information wirelessly,and the maximum measurement deviation of oxygen saturation and pulse rate were ± 1% and ± 2bpm,respectively.Finally,the results of the thesis provide a reference to the design and development of wireless sensor chip.