0.1°C accuracy ICO temperature sensor with segmentation algorithm. Issue 11 (1st May 2018)

• Record Type: Journal Article
• Authors: Li, Jing; Zhou, Pengfei; Hu, Yuanbin; Wang, Zhaochi; Wei, Yi; Li, Chengze; Wu, Kejun; Ning, Ning
• Is Part Of: Electronics letters. Volume 54:Issue 11(2018)
• Page Start: 686
• Page End: 687
• Publication Date: 2018-05-01
• Subjects: CMOS integrated circuits -- temperature sensors -- temperature measurement -- oscillators; real‐time temperature detection circuit -- current controlled oscillator -- oscillating frequency -- power supply -- temperature segmentation algorithm -- CMOS technology -- ICO temperature sensor -- power 0.3 mW -- voltage 1.8 V -- size 0.18 mum -- temperature ‐40 degC to 125 degC; Electronics -- Periodicals; 621.381
• DOI: 10.1049/el.2018.0528
• Languages: English
• ISSNs: 0013-5194

Abstract

Abstract : 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.