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该论文提出一种基于Wheatstone桥的电阻温度传感器，采用zoom-ADC架构大幅减小面积（0.25mm²），在-55°C至125°C范围内实现了0.12°C（3σ）的高精度，同时达到领先的能效，解决了传统桥式传感器面积大、能效低的问题。
Temperature sensors based on Wheatstone bridges, e.g. [1,2], have recently achieved higher resolution and greater energy efficiency than conventional BJTbased sensors [3]. However, this comes at the expense of area, making them less attractive in industrial applications. This paper presents a Wheatstone-bridge sensor that uses a zoom-ADC architecture to reduce area (by 3× over [2]) and achieve state-of-the-art energy-efficiency for an integrated temperature sensor. After a 1st-order fit and a systematic non-linearity correction [2,4], it also achieves state-of-the-art inaccuracy: 0.12°C (3σ) over the full military temperature range (−55°C to 125°C). An energy-efficient way of reading out a Wheatstone bridge (WhB) is by directly connecting it to the virtual ground established by the 1st integrator of a single-bit continuous-time delta-sigma modulator (CTΔΣM) [1,2]. A single-ended model of this system is shown in Fig. 19.2.1 (left). For maximum sensitivity, the chosen
Sining Pan, Kofi A. A. Makinwa
Delft University of Technology, Delft, The Netherlands