In this brief, we present a fully-integrated ring-oscillator based CMOS temperature sensor for Internet-of-Things. Our design relies on a low-complexity PMOS-based sensing circuit to convert temperature into two sub-threshold biasing currents. These are then used to define two oscillation frequencies, whose ratio increases linearly with the temperature. Change in the frequency ratio is finally translated into a digital output code. The proposed sensor was fabricated in 180-nm CMOS technology. When powered at 350 mV, it can achieve an energy/conversion of 0.46 nJ in a conversion time of 33 ms. Moreover, it exhibits a measurement resolution of 0.27 °C and a resolution figure-of-merit as low as 0.034 nJ °C2,.

A 0.05 mm2, 350 mV, 14 nW fully-integrated temperature sensor in 180-nm CMOS

Strangio S.;Crupi F.;
2021

Abstract

In this brief, we present a fully-integrated ring-oscillator based CMOS temperature sensor for Internet-of-Things. Our design relies on a low-complexity PMOS-based sensing circuit to convert temperature into two sub-threshold biasing currents. These are then used to define two oscillation frequencies, whose ratio increases linearly with the temperature. Change in the frequency ratio is finally translated into a digital output code. The proposed sensor was fabricated in 180-nm CMOS technology. When powered at 350 mV, it can achieve an energy/conversion of 0.46 nJ in a conversion time of 33 ms. Moreover, it exhibits a measurement resolution of 0.27 °C and a resolution figure-of-merit as low as 0.034 nJ °C2,.
Zambrano, B.; Garzon, E.; Strangio, S.; Crupi, F.; Lanuzza, M.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11568/1109302
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