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Autozero noise filtering improves instrumentation amplifier output

Posted: 29 Jul 2009 ?? ?Print Version ?Bookmark and Share

Keywords:MAX4209? instrumentation amplifier? autozero noise? ADC?

Instrumentation amplifiers are typically used in applications where a small differential signal needs to be amplified in the presence of a high common-mode voltage. Some of these applications require very high-precision amplifiers with ultra-low offset and drift, low gain error, and high common-mode reject ratio (CMRR). This article encourages designers to consider autozero instrumentation amplifiers for these applications.

Autozero instrumentation amplifiers offer high-precision offset voltage, drift, gain, and CMRR. But these amplifiers do have a drawback: significant noise at the autozero frequency and around its multiples. The autozero frequency lies outside the available bandwidth of the typical instrumentation amplifier. In some applications where the instrumentation amplifier's output feeds an ADC, this noise can be a problem.

This application note describes a simple filtering technique to reduce the autozero noise. The MAX4209 instrumentation amplifier serves as design example.

View the PDF document for more information.

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