讀出電路設計與FPGA平臺實現之葡萄糖/膽固醇/化學需氧量感測應用

Abstract

The work accomplished in this thesis discusses the design of a dual glucose/cholesterol meter based on FPGA and chemical oxygen demand (COD) sensing system based on microcontroller unit (MCU) platforms. A COD sensing system includes a readout circuit, and an analog to digital converter (ADC), and AT89S51 microcontroller unit (MCU), and a liquid crystal display (LCD) for showing the corresponding readout value. Moreover, a dual glucose/cholesterol meter consists of a dual glucose/cholesterol readout circuit, an ADC, a digital controller, a serial electrically erasable programmable read-only memory (EEPROM), and a LCD. The readout circuit is used to proportionally transfer the current signal detected by a glucose/cholesterol/COD sensor. It was fabricated by a 0.35 µm TSMC CMOS process with an area of 0.086 mm2 and 409.29 µW power consumption. The digital controller was emulated by using a field programmable gate array (FPGA) as a platform, which displays the measured result on LCD and stores the data into the serial EEPROM. The linearity of this work is 0.9850 for the current sensing range of 5.01~22.3 μA within glucose concentration range of 50~400 mg/dL with the power consumption of this system is 46.893 mW and current sensing range of 500~600 μA within cholesterol concentration range of 50~385 mg/dL. In addition, this system can produce the glucose detection (mg/dL) results within 11 seconds as well as the cholesterol detection (mg/dL) results within 20 seconds, which are faster than the previous works. Comparing to the previous systems, the experiment results show that this work has a better performance in terms of linearity, accuracy and power consumption.