Title :
A low power time-domain CMOS temperature sensor
Author :
Wonjong Song ; Hunsik Moon ; Hyeyeon Yang ; Jinwook Burm
Author_Institution :
Dept. of Electron. Eng., Sogang Univ., Seoul, South Korea
Abstract :
The proposed temperature sensor is composed of serial inverter chain and time-to-digital converter(TDC) instead of proportional to absolute temperature(PTAT) and analog-to-digital converter(ADC) for reducing current consumption. The generated temperature dependent delay is compared with temperature insensitive clock. The proposed temperature sensor´s temperature resolution is under 0.2°C and draw current is under 800 nA from a 1.8V supply voltage. The simulated temperatre range is 0~100°C and temperature error is -within ±2°C. The simulated results are trimmed by 2-point calibration. The chip is fabricated using a 0.18 μm CMOS process.
Keywords :
CMOS integrated circuits; invertors; low-power electronics; temperature measurement; temperature sensors; time-digital conversion; 2-point calibration; ADC; PTAT; TDC; analog-to-digital converter; current consumption; low power time-domain CMOS temperature sensor; proportional to absolute temperature; serial inverter chain; size 0.18 mum; temperature 0 degC to 100 degC; temperature dependent delay generation; temperature insensitive clock; time-to-digital converter; voltage 1.8 V; CMOS integrated circuits; CMOS technology; Performance evaluation; Temperature sensors; 2-point calibration; Temperature sensor; thermal sensor; time-to-digital converter (TDC);
Conference_Titel :
SoC Design Conference (ISOCC), 2014 International
DOI :
10.1109/ISOCC.2014.7087680
