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The design and experimental characterization of a potentiostat system based on a novel modular architecture are illustrated. This instrument enables three amperometric measurements in liquid (cyclic voltammetry, electrochemical impedance spectroscopy and impedance tracking in time domain) on interfacial systems whose dimensions can range from the millimeter down to the sub-micrometric scale. In particular the system is aimed at the realization of biosensors based on the impedimetric detection of conformational changes of macromolecular biochemical transducers. To achieve high resolution (attoFarad in capacitance and TeraOhm in resistance) over a wide bandwidth (DC - 1 MHz) an integrator/differentiator front-end has been designed along with all the analog circuitry and software for numerical processing of acquired data.