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本文提出一种利用指数亚阈值振荡依赖的温度传感器，通过复用IoT系统中已有的高精度定时源（如RTC）来替代传统ADC，实现了0.6nJ的超低能耗和-0.22/+0.19°C的高精度。该设计解决了传统高精度温度传感器因需要高精度ADC而功耗过高的问题。
features in IoT devices to monitor either environmental or system/chip conditions. An accurate temperature sensor usually requires carefully calibrated, high-accuracy ADCs, which prevents their use in ultra-low-power sensor nodes. In some sensing architectures, a highly accurate timing reference can replace the ADC [1]. With this in mind, we observe that almost all IoT systems incorporate a high-accuracy timing source (real-time clock, RTC) for time synchronization, data recording, and radio communication. Typically, these RTCs employ crystal or MEMS-based oscillators, or RC oscillators in extremely small form factor devices. We therefore propose to build a temperature sensor that uses a system’s core RTC as a timing reference to minimize power/area overhead. We also show a fully integrated sensor that
Kaiyuan Yang, Qing Dong, Wanyeong Jung, Yiqun Zhang,
Myungjoon Choi, David Blaauw, Dennis Sylvester University of Michigan, Ann Arbor, MI Thermal sensing is one of the most commonly desired