A CMOS quasi-digital temperature sensor for battery operated systems

This paper presents a high performance 1.2 V-0.18 μm CMOS quasi-digital temperature sensor with frequency output suitable to be used in battery operated systems. The proposed sensor is based on a multivibrator current-to-frequency converter and works properly over a temperature range of -40 to +120°C, with a minimum power consumption of 1.8 μW. It presents a linear response, with a sensitivity of 442 Hz/°C. Recovered temperature values show accuracy better than 1.7°C.