Low_noise_dc_stabilized_amplifier

Published:2009/7/23 23:52:00 Author:Jessie | From:SeekIC

This circuit combines a low-drift chopper-stabilized amplifier with an ultra-low noise bipolar amplifier. The LTC1052 measures the dc error at the LT1028 input terminals, and biases the offset pins to force offset to a few microvolts. As a result, noise is kept to a minimum. The combined characteristics of these amplifiers yield the following: offset voltage = 5μV max. offset drift = 50 nV/℃, and noise 1.1 nV HZ. Figure 1-23B plots noise amplitude over time in a 0.1- to 10-Hz bandwidth. .



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