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Improve Instrument Amplifier Performance with X2Y Optimized Input Filter

Authored on: Mar 25, 2009 by Bill Klein

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The common-mode rejection ability of an instrumentation amplifier degrades with increasing frequency often resulting in a major portion of the "advertised" bandwidth becoming unusable due to common-mode noise errors. An optimally designed passive input stage filter can provide significant improvement in AC common-mode rejection. Calculation of correct component values and selection of appropriate capacitors holds the key to the solution. A spreadsheet that gives graphic demonstration of the analysis and performs the necessary calculations to achieve this improvement is also included.



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