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 0.18μm CMOS technology supplied at 1.8V, shows 0-1MHz output frequency for 01.2V differential input operation with nonlinearity error less than 0.4% and power consumption less than 0.4 mW. A temperature compensation technique keeps the error below 5.3% over all the frequency range for a (-20°C, +120°C) span.
- Low-voltage low-power CMOS design
- Quasi-digital sensors
- Smart sensors
- Voltage-to-frequency converter
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