Common mode noise

Shielding and coating fix MIPI-driven RFI in smartphones, but they come at a cost. This award-winning approach skips the hardware entirely, using firmware alone to steer noise away from sensitive bands, with no added component cost.

When your circuit misbehaves with unexplained noise and jitter, you're facing electromagnetic coupling. This practical guide walks engineers through identifying whether problems stem from differential or common mode issues, near-field or far-field effects, and provides a systematic debugging workflow to isolate sources, paths, and receivers—getting your design back on track.

A routine radiated emissions case took an unexpected turn when slow I/O lines started radiating 100 MHz harmonics—pointing to a deeper power distribution network problem. Dr. Min Zhang traces the root cause and the PDN fixes that made the ferrite beads unnecessary.