A Reconfigurable Multimodal Sensor Interface IC Based on Direct-Conversion ΔΣ Modulator Structure

This paper presents a ΔΣ-modulator-based reconfigurable multimodal sensor interface integrated circuit (IC), offering a novel approach to the multimodal measurement of voltage, capacitive, and current signals. A direct-conversion structure is employed in the multimodal sensor interface, and its reconfigurable ΔΣ modulation scheme ensures compact die area, high energy efficiency, and enhanced dynamic range. Fabricated in a 180-nm CMOS process, the multimodal sensor interface achieves measured dynamic ranges of 70.6 dB, 97.8 dB, and 60.0 dB for voltage, capacitance, and current modes, with measured power consumptions of 22.2 μW, 23.0 μW, and 37.7 μW, respectively. The proposed system demonstrates significant improvements in the dynamic range relative to power consumption compared to other state-of-the-art multimodal sensor interface IC designs.