A novel low power wide supply voltage range CMOS temperature sensor with 0.2/0.5°C error from -20°C to 60°C

This paper proposes a quite accurate CMOS temperature sensor designed and developed for monitoring enviromental temperature. The sensor uses subthreshold MOSFET to measure temperature. The circuit has been implemented by IO thick-oxide MOS devices in 0.13um standard logic process and occupies a silicon area of 37×41um2. The performance of the sensor is highly linear and the temperature error is merely °0.2 °C/0.5°C using two-point calibration from °20°C to 60 °C. The sensor can operate under voltage from 1.8V to 3.6V with high PSRR. Test results show a responsivity of 3.9 mV/°C and power consumption of 1.3uW@1.8V. © 2012 IEEE.