Low Noise AC Difference Amplifier

Piezoelectric and LVDT (Linear Variable Differential Transformer) sensors provide differential ac output signals. In addition to a standard difference amplifier a secend amplifier can be used as a dc servo amplifier to force an output dc bias potential in single supply applications. This difference amplifier is dc coupled but acts as a high pass network for ac signals with a lower corner frequency set by R5 and C3 of the dc servo amplifier.

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