Low_noise_and_drift_dc_amplifier

Published:2009/7/22 3:32:00 Author:Jessie | From:SeekIC

This circuit combines the low noise of an LT1028 with a chopper-based carrier-modulation scheme to get a very low-noise, low-drift dc amplifier. As shown in Fig. 1-9B, noise in a 0.1- to 1-Hz bandwidth is less than 40 nV with 0.05 μV/℃ drift. In general, to maintain this low-noise performance, the source resistance should be kept below 500Ω. Such resistance is typical of transducers (strain-gauge bridges, magnetic detectors, etc.).



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