基于斩波连续时间δ - σ调制器的CMOS温度传感器

2020 International Symposium on VLSI Design, Automation and Test (VLSI-DAT) Pub Date : 2020-08-01 DOI:10.1109/VLSI-DAT49148.2020.9196368

Po-Yu Li, Wei-En Lee, Ching-Tzung Lin, Li-Te Wu, Tsung-Hsien Lin

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引用次数: 0

摘要

提出了一种采用二阶1位连续时间δ - σ调制器(CTDSM)的电阻式温度传感器，实现了一种节能的温度传感器。采用斩波技术减轻了一级放大器的偏置和闪烁噪声。在反馈路径中加入有限脉冲响应(FIR)滤波器，以减轻斩波操作引起的噪声折返。该电路采用0.18 μm CMOS芯片，功耗为183.6 μW，电源为1.8 v。在单次转换时间为333.3 μs的情况下，温度分辨率小于3.71 m°C (1δ)，其品质因数(FoM)为0.84 pJ°C2。8个芯片在- 40°C至100°C范围内的3δ温度误差在1点和批量校准后为3.8°C。

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A CMOS Temperature Sensor Based on a Chopped Continuous-Time Delta-Sigma Modulator

A resistor-based temperature sensor with a 2nd-order 1-bit continuous-time delta-sigma modulator (CTDSM) to realize an energy-efficient temperature sensor is presented. The chopping technique is applied to alleviate the offset and flicker noise of the 1st-stage amplifier. A finite impulse response (FIR) filter is incorporated in the feedback path to mitigate noise fold-back due to chopping operation. The proposed circuit, implemented in 0.18-μm CMOS, consumes 183.6 μW from a 1.8-V supply. With a single conversion time of 333.3 μs, the temperature resolution is less than 3.71 m°C (1δ), which leads to a Figure of merit (FoM) of 0.84 pJ°C2. The 3δ temperature inaccuracy of 8 chips under a range of −40 °C to 100 °C is 3.8 °C after 1-point and batch calibration.

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2020 International Symposium on VLSI Design, Automation and Test (VLSI-DAT)

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