| Summary: | 碩士 === 中原大學 === 電子工程研究所 === 104 === According to research, there are many reasons that cause urolithiasis, such as genetic, lifestyle, season and occupation etc. Moreover, the recurrence rate is very high. In order to reduce the medical expenses of the patients, it’s necessary to design a device for the prevention of urolithiasis recurrence.
The research aims to design a device for the prevention of urolithiasis recurrence. We used commercial components and microcontroller to implement the prototype. The device can detect the pH and urine conductivity. Moreover, we verified the measurement of calcium and uric acid using our designed readout circuit. For VLSI chip implementation, we used the TSMC 0.18μm Mixed-Signal 1P6M Technology. The digital back-end ASIC processes the digital signal from the ADC; the ADC used is ADS7841 which has 12 bits of resolution and has the Successive Approximation Register (SAR) architecture. The system measurement mechanism consists of calibration mode and measurement mode. In pH calibration mode, we used two points (pH4, pH7) to interpolate the unknown pH value by extracting the slope and intercept that are stored into the registers. In the measurement mode, the system will compute the concentration of the parameter through the stored slope and intercept. The design used Altera DE0 board to verify the functionality, and used TSMC 0.18μm to implement the chip. The tapeout chip operates with a clock frequency of 2 MHz, while dissipating 0.9 mW of power. The chip area is 0.66 mm2.
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