Eliminating EMI from a High-Speed Display Interface

Overview

Resolving EMC failure caused by high-speed signal coupling and unintended radiation.

Technologies

EMC | Signal integrity | High-speed electronics | Compliance engineering

Define the Problem

A product failed formal EMC testing due to radiated emissions associated with a high-speed display interface operating at 148.5 MHz.

Diagnose the Root Cause

Investigation identified signal coupling into cable structures and enclosure features, creating unintended radiating elements.

Key engineering challenges included:

• High-speed clock frequencies

• Cable coupling effects

• Enclosure interactions

• Compliance requirements

Deliver the Solution

We redesigned routing, grounding and filtering strategies to control current return paths and reduce emissions.

Key Outcomes

• Passed EN55032 Class B with margin

• Eliminated radiated emissions issue

• Avoided redesign of core electronics

• Accelerated route to compliance