title: A Low-Cost CMOS Programmable Temperature Switch.
abstract: A novel uncalibrated CMOS programmable temperature switch with high temperature accuracy is presented. Its threshold temperature Tthcan be programmed by adjusting the ratios of width and length of the transistors. The operating principles of the temperature switch circuit is theoretically explained. A floating gate neural MOS circuit is designed to compensate automatically the threshold temperature Tthvariation that results form the process tolerance. The switch circuit is implemented in a standard 0.35 μm CMOS process. The temperature switch can be programmed to perform the switch operation at 16 different threshold temperature Tths from 45－120°C with a 5°C increment. The measurement shows a good consistency in the threshold temperatures. The chip core area is 0.04 mm² and power consumption is 3.1 μA at 3.3V power supply. The advantages of the temperature switch are low power consumption, the programmable threshold temperature and the controllable hysteresis.
authors.affiliation: National Laboratory for Superlattices and Microstructures, Institute of Semiconductors, Chinese Academy of Sciences, P.O.Box 912, Beijing 100083, P. R. China.
authors.forename: Yunlong
authors.initials: Y
authors.lastname: Li
authors.affiliation: National Laboratory for Superlattices and Microstructures, Institute of Semiconductors, Chinese Academy of Sciences, P.O.Box 912, Beijing 100083, P. R. China. nanjian@red.semi.ac.cn.
authors.forename: Nanjian
authors.initials: N
authors.lastname: Wu
keywords: floating gate neural MOS; process compensation; temperature switch; threshold temperature