Circuit arrangement to suppress crosstalk in chemo-resistive sensor arrays

Modern electronic nose and such systems, typically employ gas sensors in arrays. Access to the individual elements in an m × n resistive sensor array requires m + n interconnect lines and effect of crosstalk becomes inevitable. The crosstalk is caused due to the leakage currents in the multiplexer channels as well as the parasitic paths among the non-selected elements in the array. Here, the authors present a novel circuit arrangement to suppress crosstalk in two-dimensional chemo-resistive sensor arrays. The proposed circuit employs a transistorised bypassing scheme, diodes in series and voltage feedback to nonselected elements of an array for crosstalk elimination. Simulation results of a resistive sensor array are presented. Finally, the proposed arrangement has been applied on an 8 × 2 sensor array and the result has been compared with the same array with a normal feedback arrangement for data acquisition. The work can also be extended for general resistive sensor arrays.