University of Macau / Faculty of Science and Technology / Department of Electrical and Electronics Engineering

University of Macau / Faculty of Science and Technology / Department of Electrical and Electronics Engineering

University of Macau / Faculty of Science and Technology / Department of Electrical and Electronics Engineering

University of Macau / Faculty of Science and Technology / Department of Electrical and Electronics Engineering

University of Macau / Faculty of Science and Technology / Department of Electrical and Electronics Engineering

University of Macau / Faculty of Science and Technology / Department of Electrical and Electronics Engineering

University of Macau / Faculty of Science and Technology / Department of Electrical and Electronics Engineering

University of Macau / Faculty of Science and Technology / Department of Electrical and Electronics Engineering

I rapporten presenteras en lågkostnads, portabel och bärbar design av ett nytt system med reflekterande teknik för pulsoximetri. Arbetet har utförts som ett projekt, inkluderande elektronikkonstruktion, mjukvaruutveckling, design av inkapsling för prototypen samt fortlöpande tester av både hård- och mjukvara under arbetets gång. Resultatet av arbetet är ett egenkonstruerat system för pulsoximetri. Med hjälp av bluetooth-teknik kan systemet kommunicera trådlöst med en PC, laptop eller mobiltelefon som stöder bluetooth 4.0. Mätvärden visas i realtid på PC/laptop/mobiltelefon. Programvaran är skriven i mbed med programspråket C++ för mikroprocessorn. Projektet kräver olika tekniska färdigheter såsom signalbehandling, programmering, kretskortskonstruktion och mikroprocessorer. Totalt sett är projektet en bra introduktion till medicintekniska enheter och en grund för elektronikingenjörer. Syftet och målet med examensarbetet har till större delen uppnåtts och vidare tester samt utveckling av produkten är möjlig. / In this report a low-cost, portable and wearable design of a new system with reflective technologyfor pulse oximetry is presented. The work has been executed as a project, including electronics construction, software development, a design of the embedding for the prototype and continuous tests of both the hardware and software during the work in progress. The result of this work is a prototype system for pulse oximetry. The system can communicate through Bluetooth wireless interface with a PC, laptop or smartphone which supports Bluetooth 4.0. The measurements are shown in real time on a PC/laptop/smartphone. The software is written in mbed with the language C++ for the microprocessor. The project demands different technical skills like signal processing, programming, electronic design and microprocessors. Over all the project is a good introduction for medical technology and a basis for electronic engineers. The purpose and goal with the thesis is considered to be reached for the most part and further testing and development of the product is possible.

The commercialization of Marconi’s radio transmission and reception, along with the development of integrated circuits in the 1960’s have facilitated many new consumer products for wireless communication, where the mobile phones or handsets are one. These handsets started out as a portable phone, mounted in cars, and have with time added additional services as Short Message Service, and have today become a media center with global positioning, and high-speed internet connection. This has been possible with the use of multistandard radios, that can receive and transmit information using many different wireless communication standards. Many of these handsets have one dedicated integrated radio chain for each communication standard used, which results in a large and expensive integrated circuit for these modern handsets. The challenge of today is to make modern handsets cheaper, smaller, and lower in power consumption. The power consumption is an issue of particular importance since the capacity of the available power sources do not increase with the demands of the handsets. One proposed method to do this is to move towards Software Defined Radio, where software of the handset control a single reconfigurable radio, and set which communication standard that the handset is to use. In this way, the handset can be reconfigured to communicate in the most power or data efficient way, depending on the choice of the user. The area of the Software Defined Radio receiver is also smaller than the parallel chains that are implemented today, which reduces the cost of production. The Software Defined Radio receiver is very challenging to design, since there is a large number of wireless communication standards, sometimes even within the same frequency bands. This make the reception of a weak desired signal difficult, when there may be a strong interferer in the same frequency band. A key component in the Software Defined Radio receiver is the Analog to Digital Converter. The development of new wireless communication standards requires higher performance of the Analog to Digital Converter in the receiver. This performance is hard to achieve, when the power consumption should be low, and the area should be small, especially in the modern integrated circuit technologies. This thesis put the development of the communication industry into a historical perspective, and gives a review of the fundamental development of wireless communication applications. The fundamental concepts and implementations of Analog to Digital Converters for multistandard wireless receiver chains are also covered. Finally two case studies on the design of multistandard Analog to Digital Converters for Software Defined Radio applications are presented. These Analog to Digital Converters implement different methods of reconfiguration in order to comply with the requirements of the standards. The first case study is to the knowledge of the author the first reported reconfigurable Analog to Digital Converter for Wireless Personal Area Networks, that can be reconfigured from Bluetooth to the UWB communication standard. This is done by changing the architecture of the Analog to Digital Converter from Sigma Delta type to flash type. This reconfigurable Analog to Digital Converter is implemented at transistor level. The second case study investigates the limits of circuit level reconfigurability in an algorithmic Analog to Digital Converter. It is found that the requirements of two wireless communication standards can be covered with the use of smart circuit design techniques. The performance of this Analog to Digital Converter has been validated with experimental measurements. / QC 20100729