Smart Interface Circuit to Ameliorate Loss of Measurement Range in Chemical Microsensor Arrays

A programmable analog sensor interface integrated with an array of heterogeneous chemical FET/resistive sensors is presented. The sensory interface primarily addresses the problem of loss of measurement range due to large variations in baseline signals among sensors in the array. A circuit is proposed to cancel the baseline signals in the sensor array leading to improved measurement resolution. An integrated sensory array and interface electronics chip is fabricated and tested to perform odour analysis