A study of CMOS integrated circuits for the application of humidity sensing

• Main Authors: Luo Bing Yi, 羅稟邑
• Other Authors: Cheng-kuang Liu
• Format: Others
• Language: zh-TW
• Published: 2007
• Online Access: http://ndltd.ncl.edu.tw/handle/51640580043708756111

碩士 === 國立臺灣科技大學 === 電子工程系 === 95 === In this thesis, a study of CMOS integrated circuits for the application of automatic humidity sensing is presented.We study three topics﹕ the humidity determination､the transi- mpedance､and the limiting amplifier. In the first part, we use the humidity sensing module and the LabVIEW for realization. A temperature sensor connecting to humidity sensing module which is then connected to a computer by a GPIB – USB line, is used to determine the temperature using the LabVIEW in the end. Next, we propose a new method to measure the humidity. We take the temperature sensing module by electronic video camera, which is connected to a computer by a video capturing card, the degree of solidification in temperature sensing module is determined by C++ program. Then, the humidity can be obtained from the data bank of temperature and humidity. In the second part, we design the amplifier related to humidity measurement, using TSMC 0.35 m CMOS process. An automatic gain control circuit is also designed. Beside, the transimpedance amplifier is followed by another amplifier. A design of limiting amplifier with offset cancellation circuits is shown.