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나준석,신우설,곽봉춘,홍성관,권오경 대한전자공학회 2017 Journal of semiconductor technology and science Vol.17 No.1
A CMOS-based temperature sensor is proposed for low-voltage and low-power on-chip thermal monitoring applications. The proposed temperature sensor converts a proportional to absolute temperature (PTAT) current to a PTAT frequency using an integrator and hysteresis comparator. In addition, it operates in the subthreshold region, allowing reduced power consumption. The proposed temperature sensor was fabricated in a standard 90 nm CMOS technology. Measurement results of the proposed temperature sensor show a temperature error of between −0.81 and +0.94°C in the temperature range of 0 to 70°C after one-point calibration at 30°C, with a temperature coefficient of 218 Hz/°C. Moreover, the measured energy of the proposed temperature sensor is 36 pJ per conversion, the lowest compared to prior works.