EMC Consutancy & Design solutions

When I debug EMC problems on a DC/DC converter, I use a very simple test to understand whether the dominant mechanism is Differential Mode (DM)  or Common Mode (CM) . The test is simple: I increase the load and observe what happens to the emissions. If: The peak frequencies stay the same, But the amplitude increases with load, then the behaviour is consistent with differential-mode emissions . This is aligned with what TI explains in their EMI material: Differential-mode nois