An Infrared Photocurrent Intensity to Continuous-Time Incremental Sigma-Delta Modulator for Monitoring Unplanned Self-Extubation of Patients in Medical Institution

• Main Authors: Liu, Kang-Yu, 劉康宇
• Other Authors: Chiang, Cheng-Ta
• Format: Others
• Language: zh-TW
• Published: 2018
• Online Access: http://ndltd.ncl.edu.tw/handle/as6qp8

碩士 === 國立嘉義大學 === 電機工程學系研究所 === 107 === An infrared photocurrent intensity to continuous-time incremental sigma-delta modulator (CT-IDSM) for monitoring unplanned self-extubation of patients in medical institution. Being a general-purpose infrared photocurrent intensity transducer, it can have characteristics of the easier usage and lower cost compared to traditional infrared photocurrent intensity detecting devices. The output signal of the proposed chip is a pulse stream, it could be easily sent over a wide range of transmission media. Different to previous works, the proposed chip is detecting infrared photocurrent intensity in medical institution and also immune to low frequency noise of the ambient light. Based upon the device parameters of TSMC 0.35 µm 2P4M CMOS technology with 3.0 V power supply, all the functions and performance of the proposed chip are successfully tested and proven through SPICE simulations and measurements. The measured range of infrared light source distance is from 15 to 29 cm, the corresponding induced photocurrent is 2.0135 to 0.796 μA and it corresponding measured signal-to-noise-distortion ratio (SNDR) is 80.9 to 74.9 dB. The chip area is 1.218 x 2.044 mm2. By proven through measurements, when the distance between infrared light source and the proposed chip where is fixed on locations of intubation is farer, the corresponding SNDR is lower. Conversely, the distance between infrared light source and the proposed chip where is fixed on locations of intubation is closer, the corresponding SNDR is higher. Nurses in nursing station can aware much faster and convenient by the SNDR once there are patients trying to extubate by themselves.