本論文提出一個應用在生醫上的無線溫度感測節點，此系統主要可分為三個部份：讀取電路、溫度感測器和射頻2.4 GHz通訊系統。無線感測端主要是將所量取到的生醫訊號，經讀取電路和類比數位轉換器數位化後，再調變和升頻，以2.4 GHz的ISM 頻帶來傳送。當收集點收集到數個感測端所傳送的生醫訊號時，收集點會進行數據融合，再將融合後的數據傳送到系統端作數據分析及監控。以低功率短距離傳送的生醫訊號來說，相信未來可利用此系統來廣泛應用在生醫的監測上。
在本論文中，分別設計的晶片有讀取電路、三角積分類比數位轉換器、溫度感測器，以及射頻2.4 GHz通訊系統的設計考量。一般工業上應用之讀取電路，以放大器、程式增益放大器、高通慮波器和低通濾波器的結合來完成，本論文其中提出一個功能相當於現時工業上所應用之讀取電路，卻省下了高通慮波器的硬體電路，不但可以省去高通慮波器功率消耗的部分，更可依不同的應用下來變化它的頻寬和增益，結果顯示，與現時工業上所應用之讀取電路來比較，大約可省下20%的功率消耗。溫度感測器利用了電晶體對溫度的線性特性，經過三角積分類比數位轉換器，透過微控制器以壓縮的方式傳出。量測結果分為工作模式和閒置模式，其功率消耗分別是807 μW和240 μW，平均的功率消耗為268.4 μW，在0度與80度之間，其不準確度在±0.1度以下，而在體溫(37 ± 5度)，其不準確度在±0.05度以下，在低不準確度和低功率的消耗下，這是非常適合應用在人體以及生物醫學上。

This thesis presents a wireless thermal sensor node for biomedical applications. The proposed system is composed of three parts, Readout Circuit, Thermal Sensor, and 2.4 GHz Wireless Communication System. The main function of wireless sensor node is detecting biomedical signals firstly. After readout circuit, analog signals will be converted to digital signals by ADC. Finally, the digital signals will be transmitted by 2.4 GHz ISM band after the modulation process. When the collector of sensor group receives the biomedical signals from different sensor nodes, the merge data circuit will merge the received data and then transmit the merged data to central system for analyzing and monitoring. According to low power and short distance transmission for biomedical applications, multiple applications could be detected in the same time. The system will be suitable for biomedical monitoring applications in the future.
In this thesis, we designed chips of readout circuit, sigma-delta modulator, and thermal sensor, and discuss the consideration of 2.4 GHz Wireless Communication System. A general readout circuit consists of a charge amplifier, a program gain amplifier, a high pass filter, and a low pass filter. The proposed readout circuit has the same function without high pass filter. This design not only reduces the power consumptions by high pass filter, but also controls the bandwidths and gains for different applications. The comparison with previous work shows the power consumption was reduced about 20%. The principle of thermal sensor is using the transistors that are highly sensitive devices with linear characteristic and are readily integrated on the CMOS silicon chip. After integrating by sigma-delta modulator, the temperature values would be transmitted by transmitter after compressing. The power consumption is 807 μW or 240 μW for work mode or sleep mode and the average power consumption is 268.4μW. As a result, in the range of 0 oC to 80 oC C or body temperature (37 ± 5 oC), the inaccuracy is less than ± 0.1 oC or ± 0.05 oC respectively with one-point calibration after packaging. Thus, the very low inaccuracy and power consumption of the sensing chip in the human body temperature range renders the proposed thermal detection system suitable for biomedical application.

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