A Hybrid Thermal-Diffusivity/Resistor-Based Temperature Sensor with a Self-Calibrated Inaccuracy of ±0.25°C (3σ) from −55°C to 125°C

📋 论文概要

该论文提出了一种混合温度传感器，结合了高精度但功耗高的热扩散率传感器和低精度但高效的电阻式传感器，利用前者对后者进行自校准，从而在无需外部温度参考的情况下实现±0.25°C（3σ）的精度。解决了电阻式传感器通常需要两点校准而成本高的问题。

💡 主要创新点

• 提出混合架构，利用热扩散率传感器的高精度自校准电阻式传感器，无需外部温度参考。
• 实现了单点校准即可达到与两点校准相当的精度，降低了校准成本。

🏷 关键词

📄 原文摘要

Resistor-based temperature sensors can achieve higher resolution and energy-efficiency than traditional BJT-based sensors. To reach similar accuracy, however, they typically require 2-point (2-pt) calibration, compared to the low-cost 1-pt calibration required by BJT-based sensors. This paper presents a hybrid temperature sensor that uses an inherently accurate, but power-hungry, thermal-diffusivity (TD) sensor [1] to selfcalibrate an inaccurate, but efficient, resistor-based sensor [2]. The use of an on-chip reference obviates the need for accurate temperature stabilized ovens or oil baths, drastically reducing calibration time and costs. Furthermore, by sharing most of the readout circuitry, the associated area overhead can be reduced. After self-calibration at room temperature (RT, ~25°C) and at an elevated temperature (~85°C), the proposed hybrid temperature sensor achieves an inaccuracy of 0.25°C (3σ) from $55°C to 125°C.

👥 作者与机构

Sining Pan, Jan A. Angevare, Kofi A. A. Makinwa

Delft University of Technology, Delft, The Netherlands