Open Access0.1°C accuracy ICO temperature sensor with segmentation algorithm
Author(s) -
Li Jing,
Zhou Pengfei,
Hu Yuanbin,
Wang Zhaochi,
Wei Yi,
Li Chengze,
Wu Kejun,
Ning Ning
Publication year - 2018
Publication title -
electronics letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.375
H-Index - 146
ISSN - 1350-911X
DOI - 10.1049/el.2018.0528
Subject(s) - linearity , temperature measurement , power consumption , power (physics) , segmentation , cmos , change detection , computer science , electronic engineering , algorithm , materials science , engineering , artificial intelligence , physics , quantum mechanics
A real‐time temperature detection circuit with 0.1°C accuracy is presented. The temperature sensor is composed by a current controlled oscillator (ICO). Its oscillating frequency is proportional to the temperature but independent with the power supply. The frequency change will be digitised by a counter and thus realise the temperature detection. The detection accuracy is limited by the linearity of ICO. In order to improve temperature detection accuracy, a temperature segmentation algorithm is proposed. The temperature sensor is implemented with 0.18 μm CMOS technology and the core area is 0.023 mm 2 . The power consumption of the proposed sensor is 0.3 mW with 1.8 V supply. Experimental results show that this sensor can detect the temperature from −40 to 125°C with 0.1°C accuracy and the detection error is within ±0.8°C.