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We present a very low voltage low power Differential Difference Amplifier based second generation current conveyor (DDCCII) for the readout of the voltage value coming from potentiometric sensors and to be used in a self‐powered wireless sensor network for monitoring contaminants in hydric systems. Since the DDCCII is an extremely versatile block, it can be configured to give either an output voltage or a current directly proportional to the generated sensor voltage. The whole circuit has been designed in a CMOS 0.18 μm standard technology with a total supply voltage of 1 V and a standby current and power of about 10 μA and 10 μW, respectively.

We present a novel current‐mode fully‐integrable oscillating circuit for the interfacing of resistive gas sensors, using a reduced number of active blocks, in particular low voltage low power Second Generation Current Conveyors (CCIIs), to be used in portable applications. The proposed front‐end, operating a Resistance‐to‐Time (R−T) conversion, can be utilized for AC‐excited resistive sensors and does not need any initial calibration. Simulation and preliminary measurement results on a prototype board performed on the whole system have shown good linearity and agreement with theoretical expectations.