A CMOS Differential Voltage-to-Frequency Converter with Temperature Drift Compensation

Konferenz: RFID Systech 2010 - European Workshop on Smart Objects: Systems, Technologies and Applications
15.06.2010 - 16.06.2010 in Ciudad, Spain

Tagungsband: RFID Systech 2010

Seiten: 6Sprache: EnglischTyp: PDF

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Valero, M. R.; Celma, S.; Calvo, B.; Medrano, N. (Group of Electronic Design - I3A, University of Zaragoza, 50009 Zaragoza, Spain)

This paper presents a new CMOS differential voltage-to-frequency converter (VFC) which targets front-end sensor interfacing in wireless sensor network applications. The proposed VFC, designed in a low-cost 0.35 µm CMOS technology supplied at 3 V, achieves high performances: power consumption below 0.3 mW, 0 - 2V differential input range operation and nonlinearity error less than 0.3 %. Thanks to the introduction of a very simple control circuit, linearity is preserved over variations of temperature: the error is less than 2.3 % over all the frequency range for a temperature range from -40deg C to +120deg C.