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RFI problem of Instrumentation

Question asked by Verti on Nov 22, 2016
Latest reply on Jun 27, 2017 by Emman.A

Dear Sir,

        Our design will use instrument amp after sine excitation signal.  We are learning about “The Designer’s Guide to Instrumentation Amplifiers ” and find below info.

Follow the description seems it's for DC excitation signal. So my confusion is ,

If it's AC excitation signal, how to design the -3dB diff and CM frequency of RFI filter?

If the input AC signal is with 100kHz, the filter's -3dB frequency should be above 100kHz, that's right?