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Low noise DC amplifier with selectable gain and auto-zero functionality for use with modern integrated A/D converters
Tomíček, Pavel ; Levek, Vladimír
This paper presents the design and noise measurements of amplifier suitable for use with modern integrated A/D converters. Proposed topology is capable of both amplifying and attenuating its input signal to utilize whole input voltage range of A/D converters. Experimental version achieved full scale input voltage range from ±15 V to ±15 mV. Suppression of offset error associated with amplifier and A/D converter systems is realized using auto-zero scheme. Resulting amplifier used in conjunction with digital filters can achieve more than 20 noise free bits on all gain settings.

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