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Common mode filter on AD9122 output?

Question asked by JimBeck on Mar 25, 2013
Latest reply on Mar 25, 2013 by Tguy

The AD9122 data sheet (page 48) recommends adding a common mode choke to the output before the filter, when driving a modulator in baseband applications.  The AD9122-M5375-EBZ board includes such a choke in the filter path, but the same design in the FMCOMMS1 board does not.

The FMCOMMS1 board has a choke, but it is in the path that brings the signal out to an external connector, and is not in the filter path.

What's the right approach?

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