A resistive sensing and dual-slope ADC based smart temperature sensor

作者：Zou Lei^*

来源：Analog Integrated Circuits and Signal Processing, 2016, 87(1): 57-63.

DOI：10.1007/s10470-016-0709-1

• Smart temperature sensor
• Resistive sensing
• Ratiometric
• SOI CMOS
• Integrating ADC

Modern temperature sensors are applied in industrial electronics where the operating temperature is beyond 150 A degrees C. Existing smart temperature sensors normally support an operating temperature below 125 A degrees C. This paper describes a low-complex high-temperature smart temperature sensor based on resistive ratiometric temperature sensing concept. The sensor elements comprise only two on-chip temperature-dependent resistors. By measuring the ratio of the two resistors, the sensor's actual temperature information is obtained. Especially, non-linear temperature dependent characteristic of the resistor is analyzed and considered in this design. Also, a dual-slope ADC with autozero enabled is developed to determine the ratio of the two resistors and provide the corresponding digital output. The proposed temperature sensor is fabricated in a mature SOI CMOS technology. Experimental results show that a temperature inaccuracy of 2.5 A degrees C can be achieved over a wide temperature range from 25 to 200 A degrees C.

• 出版日期2016-4