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Sensors 2008, 8(5), 3150-3164;

A Low-Cost CMOS Programmable Temperature Switch

National Laboratory for Superlattices and Microstructures, Institute of Semiconductors, Chinese Academy of Sciences, P.O.Box 912, Beijing 100083, P. R. China
Author to whom correspondence should be addressed.
Received: 2 April 2008 / Accepted: 8 May 2008 / Published: 15 May 2008
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A novel uncalibrated CMOS programmable temperature switch with high temperature accuracy is presented. Its threshold temperature Tth can 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 Tth variation 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. View Full-Text
Keywords: temperature switch; floating gate neural MOS; threshold temperature; process compensation temperature switch; floating gate neural MOS; threshold temperature; process compensation
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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Li, Y.; Wu, N. A Low-Cost CMOS Programmable Temperature Switch. Sensors 2008, 8, 3150-3164.

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