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CMOS Voltage-to-Frequency Converter With Temperature Drift Compensation

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4 Author(s)
Valero, M.R. ; Dept. of Electron. Eng. & Commun., Univ. of Zaragoza, Zaragoza, Spain ; Celma, S. ; Calvo, B. ; Medrano, N.

This paper presents a new complementary metal-oxide-semiconductor (CMOS) differential voltage-to-frequency converter (VFC) suitable for sensor signal conditioning. Designed in a low-cost 0.18- μm CMOS process, the proposed VFC consumes less than 0.4 mW at a 1.8-V supply. For a differential input range of 0-1.2 V, output frequency varies from 0.1 to 1.1 MHz with a linearity error of less than 0.4%. A new temperature compensation technique keeps the gain error below 2.4% over the whole frequency span for a range of -20°C- +120°C.

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Instrumentation and Measurement, IEEE Transactions on  (Volume:60 ,  Issue: 9 )