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The defense date of the thesis is 2013-08-23
The current date is 2019-05-22
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URN etd-0823113-154517 Statistics This thesis had been viewed 1047 times. Download 1 times. Author Yu-Heng Huang Author's Email Address No Public. Department Electrical Engineering Year 2012 Semester 2 Degree Master Type of Document Master's Thesis Language English Page Count 72 Title 8-BIT CMOS PH-TO-DIGITAL CONVERTER WITH EGFET Keyword ADC sensor readout circuit temperature sensor temperature sensor readout circuit sensor ADC Abstract A pH value sensing system with digital outputs consists of readout circuit, a temperature compensation circuit in the front end and an analog-to-digital converter (ADC) in the back end. In this thesis, a low power consumption threshold-voltage based readout circuit is presented, and temperature compensation circuit is achieved by using a negative temperature coefficient generator to compensate the readout circuit. In addition, an 8-bit dual slope ADC is designed to convert the output of the pH sensor to a digital code. The simulation results obtained from HSPICE using a standard TSMC 0.35μm CMOS models and 3.3V power supply are presented in the thesis.
This sensor is almost insensitive to the temperature and is linear dependent to pH value. The simulation result shows that the voltage output of the sensor has the temperature coefficient of 0.03mV⁄℃ from 0℃ to 100℃, and sensitivity is 46.88mV⁄pH. The 8-bit dual slope ADC output code is from 15 to 196 for pH1 to pH10, which can meet the requirement of the pH value sensing system.
Advisor Committee Shu-Chuan Huang - advisor
none - co-chair
none - co-chair
Files Date of Defense 2013-07-15 Date of Submission 2013-08-23