Abstract
Modern temperature sensors are applied in industrial electronics where the operating temperature is beyond 150 °C. Existing smart temperature sensors normally support an operating temperature below 125 °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 °C can be achieved over a wide temperature range from 25 to 200 °C.
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