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Filtering technique to lessen autozero noise

Posted: 20 Jul 2009     Print Version  Bookmark and Share

Keywords:MAX4209  instrumentation amplifier  autozero noise  filtering 

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 amps with ultra-low offset and drift, low gain error, and high common-mode reject ratio (CMRR). This article encourages designers to consider autozero instrumentation amps for these applications.

Autozero instrumentation amps offer high-precision offset voltage, drift, gain, and CMRR. But these amps 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 amp. In some applications where the instrumentation amp's output feeds an analogue-to-digital converter (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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