Abstract
This paper presents a 36nW high-accuracy subthreshold oscillator-based temperature sensor in 180nm. The proposed super cut-off contention-free (SCCF) delay cell closely mimics the temperature dependency of a single MOS, leading to bestin-class -0.072/+0.082∘C(±0.27∘C) inaccuracy after 2-(1-) pt calibration. A compact voltage regulator with three native transistors realizes 0.02%/°C line sensitivity and 1mK noise floor. A uniform resolution frequency to digital converter (FDC) keeps the sensing resolution constant across a wide temperature range. In addition to standard testing, the 1-pt calibrated sensor was demonstrated for in-vivo animal body temperature tracking and outperformed off-the-shelf solutions.
Type
Publication
2023 IEEE Symposium on VLSI Circuits
Wei Wang
Ph.D. Student (started in 2021)
Liwen Jiang
MECE 2021, now at NVIDIA
Yumin Su
Ph.D. Student (started in 2023)
Zhiyu Chen
PhD 2023, now at Apple
Zhanghao Yu
PhD 2023, now at Intel
