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本文提出一种基于惠斯通电桥的温度传感器，采用FIR-DAC ADC替代传统连续时间ADC，在保持高能效的同时将面积和能效均提升2倍，实现了20fJ·K2的分辨率FoM。
Temperature sensors intended for embedded applications should be both energyand area-efficient. The combination of Wheatstone-bridge (WhB) sensors and continuous-time ADCs has proven to be highly energy efficient [1,2]. However, their area (> 0.25mm2) is still larger than that of comparable BJT-based sensors [3,4]. This paper presents a temperature sensor that uses an FIR-DAC ADC to reduce its area and increase energy-efficiency, both by 2× compared to the stateof-the-art [5]. A simplified model of the sensor is shown in Fig. 10.4.1 (top). To maximize its sensitivity, the WhB consists of resistors Rp (105kΩ, silicided p-poly) and Rn (100kΩ, non-silicided n-poly) with positive and negative temperature coefficients (TCs), respectively [1,2]. Its temperature-dependent output current Isig is then digitized by a continuous-time delta-sigma modulator (CTΔΣM), which balances Isig with the current IDAC generated by a 2b resistive DAC RDAC (4×720kΩ, nonsilicided n-poly).
Sining Pan, Kofi A. A. Makinwa
Delft University of Technology, Delft, The Netherlands