A CMOS-based Temperature Sensor with Subthreshold Operation for Low-voltage and Low-power On-chip Thermal Monitoring

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 operate...

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Bibliographic Details
Published in:Journal of semiconductor technology and science 2017, Vol.17 (1), p.29-34
Main Authors: Na, Jun-Seok, Shin, Woosul, Kwak, Bong-Choon, Hong, Seong-Kwan, Kwon, Oh-Kyong
Format: Article
Language:Korean
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Summary: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 $+0.94^{\circ}C$ in the temperature range of 0 to $70^{\circ}C$ after one-point calibration at $30^{\circ}C$, with a temperature coefficient of $218Hz/^{\circ}C$. Moreover, the measured energy of the proposed temperature sensor is 36 pJ per conversion, the lowest compared to prior works.
ISSN:1598-1657