This paper presents a simple but effective linear frequency output temperature sensor based on a multivibrator current-to-frequency converter. Post-layout simulation results for a 1.2 V 0.18- μm CMOS design show high linearity over a temperature range from -40°C to +120°C, with an accuracy of ±1°C, a sensitivity of 354 Hz/°C and only 3 μW of power consumption, which makes the design suitable for portable systems.
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Azcona et al. (2014) studied this question.
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