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Fluctuation Enhanced Sensing is a well known technique, based on noise measurements, to improve sensitivity and selectivity for chemical/biological sensing. Trans-impedance amplifiers (TIAs) are the natural choice as front-end for the measurement of the low frequency noise (LFN) generated by the sensor. In this work we propose a low-noise TIA topology which allows maintaining a large bandwidth also...
A new topology for the implementation of a very low offset voltage preamplifier is presented. The new topology employs a time-varying resistance as a probe for detecting the sign and magnitude of the equivalent input offset of an operational amplifier in a series-shunt feedback configuration and allows for continuously correcting the offset voltage by means of a proper control feedback. The most remarkable...
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