Broadband capacitive sensor CMOS interface circuit for dielectric spectroscopy

A broadband current-mode interface circuit performing capacitive measurements suitable for implementation in CMOS technology is suggested. A capacitance change in the sensor capacitor translates uniformly into a DC voltage change at the output over a broad frequency range (1M~1G). This wideband operation enables the performance of broadband dielectric spectroscopy measurements. The circuit has been shown to have a capacitance resolution of 0.7fF and dynamic range of 500fF. It has been designed in 0.18mum CMOS technology and consumes 10.46mW of power at a power supply of +/-1 V

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