Operational Amplifiers

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" summary

Demo shows an electrochemical gas sensor current of few nA per ppm fed into a transimpedance amplifier built with ST’s TSU111 CMOS zero-drift op amp. The op amp claims input bias current roughly three orders of magnitude below the sensor current and quiescent consumption of 900 nA at 25°C, so the converted voltage goes to an MCU ADC for concentration readout and supports long life for battery powered and automotive AEC‑Q100 applications.

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