A High-Precision CMOS Temperature Sensor with Thermistor Linear Calibration in the (−5 °C, 120 °C) Temperature Range

Abstract

A high-precision Complementary Metal-Oxide-Semiconductor (CMOS) temperature sensor for (−5 °C, 120 °C) temperature range is designed and analyzed in this investigation. The proposed design is featured with a temperature range selection circuit so that the thermistor linear circuit automatically switches to a corresponding calibration loop in light of the temperature range besides the analysis of the calibration method. It resolves the problem that the temperature range of a single thermistor temperature sensor is too small. Notably, the output of the proposed design also attains a high linearity. The measurement results in a thermal chamber justifying that the output voltage is 1.96 V to 4.15 V, the maximum linearity error ≤1.4%, and the worst temperature error ≤1.1 °C in the temperature range of −5 °C to 120 °C.

Optimized Calibration Method for Analog Parametric Temperature Sensors

“…(3) in practical calculations, terms of sum, a2ln 2 R, a3ln 3 R etc. are neglected due to the fact that their contribution to the calculation result is quite small [10,11,22].…”

“…where, RLM(T) and Rl(T) are static characteristics of thermistor conversion with coefficients obtained by approximation with the Levenberg-Maquardt method using 10 temperature reference values (R0=6714 Ohm and B=3173K), and using the proposed normalized complex indicators (9) and (11), respectively. Changes in the relative approximation error (14) of the Steinhart-Hart equation in the temperature range from 0 to 100°C for fixed values of the second reference standard temperature are shown in Figure 14.…”

“…Based on the analysis of the results obtained, it was found that the choice of the value of the second reference standard temperature in the recommended range from Tend1 to Tend2 allows reducing the approximation error of the static conversion characteristic by two reference values by at least 3 times. The use of the second reference standard temperature, the values of which are determined by the normalized complex indicators (9) and (11), allows the use of the two reference standard temperatures for calibrating thermistors while maintaining the approximation accuracy with the Levenberg-Maquardt method.…”

“…Results of the studies substantiated the possibility of using a two-parameter equation which describes the conversion characteristic of thermistors and is a simplified model of the Steinhart-Hart equation in various temperature ranges [10]. The possibility of using thermistors as primary measuring transducers of modern information measurement systems is mathematically substantiated and experimentally proved [11].…”

Design and Performance Analysis of a Multilayer Sea Ice Temperature Sensor Used in Polar Region

“…However, most temperature automatic detection equipment used in the conventional environment cannot be directly applied to the observation in the Arctic and Antarctica, due to the extreme cold environment. Conventional temperature sensors include resistances, thermocouples, bimetallic structures, which are metallic, and semiconductors such as diodes and chip integrated circuits [4,5,6]. Metallic temperature sensors placed in sea ice may cause local melting in the sea ice and then liquid water may appear around the sensors affecting the measurement of sea ice temperature.…”