Consejo Superior De Investigaciones Cientificas

Institucio Catalana De Recerca I Estudis Avancats

UniversitÄt Autonoma De Barcelona

Fundacio Institut Catala De Nanociencia I Nanotecnologia (icn2)

Fundacio Institut Catala De Nanociencia I Nanotecnologia

Francisco Serra Graells

José Antonio Garrido Ariza

Lluis Antoni Terés Terés

Michele Dei

Jose Agustín Cisneros Fernández

Anton Guimerà Brunet

An apparatus and a method using no switching elements for multiplexing and reading arrays of sensors whose electrical resistance is modulated by the signals to be measured are proposed. Sensor elements are arranged in groups and columns where each column is fed with a continuous voltage waveform of different amplitude, frequency and phase characteristics which then produce current signals that are modulated by the variable resistance signals to be measured. Modulated currents are summed row-wise and collected at the read-out circuits, either by applying a constant voltage to each row of the array or by connecting a capacitor and converting these current summations into output voltage signals. The read-out circuits de-multiplex each individual sensor signal to be measured by lock-in demodulation according to the frequencies and phases employed for the stimulation of each column.

Circuit for the multiplexing and read-out of variable-resistance sensor arrays

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BELLATERRA, Spain

Francisco Serra Graells