透過您的圖書館登入
IP:44.220.131.93
  • 學位論文

應用於生醫頻段之超低功率消耗接收機

An Ultra-Low Power Consumption Receiver in Bio-Medical Use

指導教授 : 呂學士

摘要


近年來,隨著人口結構逐漸老化,老人照護逐漸成為相當重要的議題。無論是健康或是受疾病所苦之老人,對於醫療資源的需求皆日日增加,但老年人求醫不便,耗費的不只是時間金錢,曝露於醫療場所更增加了感染的機率,因此個人居家醫療之市場即應運而生。 個人化居家醫療可以讓使用者免去舟車勞頓之苦,即可隨時更新並監控病患之生理資訊。由於是居家使用,其監測儀器必須要有輕便可攜、無線傳送資料之特點。於是,低成本、低功率消耗及可短距離無線傳輸之收發機愈顯得重要。為了達到上述目標,本篇論文提出一可利用於生醫頻段之低功率無線收發機之架構,並為了將來可以與其他後端架構整合而實現在標準之0.18 微米CMOS 製程。 為了達成低功率消耗的目的,本論文採用超再生接收機之架構。此架構以低功率消耗、低複雜度及低成本著稱。此篇論文中,低噪音放大器為接收機的第一級輸入,搭配上新型之數位控制震盪器,可大大節省功率消耗。除此之外,本晶片更引入數位控制區塊,此數位區塊可操控數位類比轉換器,改變數位控制震盪器之偏壓電流進而改變其震盪幅度。 此接收機與一頻率調變發射機整合於同一晶片上。由於此顆晶片展現高度之整合性,大大降低整體系統之功率消耗以及製作成本。如此一來更有益於居家醫療照護之整合應用。

關鍵字

接收機 超再生

並列摘要


In recent years, the importance of low-cost, accessible and flexible health care has increased dramatically. For all demographics, from the elderly to those inflicted with diseases, the need for remote medical resources is growing every day. Not only is it inconvenient for elders to travel to the doctor, but there is also risk involved due to the exposure to various pathogens within medical facilities that increase the probability of infection. All of this has given rise to an expanding market in the personal homecare service industry. Personal homecare service has numerous benefits. Firstly, it prevents the users from tiring and lengthy traffic, as patients don’t have to leave their homes for the service. Secondly, real time renewal and supervision of patients’ medical data can be performed remotely. Thirdly, a patient’s quality of life can remain unaffected if the sensors and remote medical systems can be made light, portable, self-powered, highly-integrated and capable of wireless communication. For these and other reasons, the Medical Implant Communication Service (MICS) has been developed and operates in a dedicated frequency band between 402 and 405 MHz. It allows bi-directional radio communication with medical implants such as pacemakers and other electronic implants. Therefore, a low-cost and ultra-low-power wireless transceiver operating in the MICS band and implemented in s standard 0.18μm CMOS process is the primary aim of this thesis. In order to realize the challenging <1 mW power requirement a super-regenerative receiver structure is adopted for OOK modulation. In the receiver, the LNA is implemented to amplify the signal and filter out the out-band signals. A digital-controlled oscillator (DCO) is employed to replace the conventional voltage-controlled oscillator (VCO). The DCO is an important component in the transmitter necessary for realizing FSK modulation without the need for another oscillator. Another unique feature different from conventional super-regenerative receivers is the addition of a digital-backend block to perform calibration and signal demodulation. In addition, it also controls the digital-to-analog convertor that controls the current bias of the oscillator. The integration of the transceiver reduces not only the system power consumption but also the overall system complexity and cost. The integrated solution achieves low cost goal and would be beneficial to the development of personal home care services.

並列關鍵字

receiver super-regenerative bio-medical

參考文獻


[1.1] M. C. Huang, J. C. Huang, J. C. You, G. J. Jong, “The Wireless Sensor Network for Home-Care System Using ZigBee”, Intelligent Information Hiding and Multimedia Signal Processing, Volume 1, 26-28 Nov. 2007, pp.643-646.
[1.2] Zhaomin Zhang, Aiguo He, and Daming Wei, “A Mobile Teleconference System for Homecare Services”, Proceeding of the 2005 IEEE Engineering in Medicine and Biology 27th Annual Conference, Shanghai, China, September 2005, pp. 3935-3938.
[1.3] R. G. Lee, C. C. Lai, S. S. Chiang, H. S. Liu, “Design and Implementation of a Mobile-Care System over Wireless Sensor Network for Home Healthcare Applications ” Proceeding of the 28th IEEE EMBS Annual International Conference New York City, USA, Aug . 2006, pp.6004-6007
[2.1] Pui-In Mak, Seng-Pan U, and Rui P. Martins, “Transceiver Architecture selection: Review, State-of-the-Art Survey and Case Study,” IEEE CIRCUITS AND SYSTEMS MAGAZINE, Vol. 7, Issue 2, 2007.
[2.2] C. Dehollain, M. Declercq, N. Joehl and J.-P. Curty, “A global survey on short range low power wireless data transmission architectures for ISM applications,” Proceedings of IEEE International Semiconductor Conference, Vol. 1, pp. 117-126, October 2001.

延伸閱讀