Compact FPGA-based elaboration platform for wide-bandwidth electrochemical measurements

A novel mixed-signal generation, acquisition and elaboration motherboard for electrochemical sensing is presented. This compact USB-controlled instrument is based on a FPGA for fast real-time execution of multiple measurement families: amperometry, voltammetry and impedance spectroscopy in particular. A digital dual-phase lock-in demodulator based on an internal DDS/PLL has been embedded with a custom analog front-end to provide an extended frequency range up to 10MHz. The design and experimental characterization of the full instrument encompassing fast (14bit, 80MSa/s) and auxiliary precise (18bit, 100kSa/s) channels are here discussed.