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ADP5071 EMI suppression in Radiative Emission certification test


I've recently developed a power board for a frontend data acquisition system, in which I've the ADP5071 to provide the +/-5V for opamp circuitry. 

I've used the recommended schematics and board layout described in the datasheet, however during the certification process it was identified high values of radiative emission with a fixed frequency ~2.4Mhz. Any hints how to fix this?

Thank you in advance