EMC Design Guidance

Nearly every aspect of electronic design and packaging affects the electromagnetic interference characteristics of the product. At every step of the design, from component selection to system integration, there are opportunities to improve (or degrade) EMI performance. A multi-faceted, multi-discipline approach to EMC design assures the greatest success.

By taking a proactive, preemptive approach, EMI control measures can be integrated into the design. The result is an optimized design that meets its EMI requirements with the lowest cost, lowest expense, and lowest impact on the product design.

Designing EMI filters that perform as intended isn’t always easy. There are often conflicting electrical and mechanical constraints and frequently the level of filtering required and the optimal filter topology isn’t obvious. As a result, EMI filters are often designed by trial and error and the final design may larger, heavier, and more costly than necessary.

We specialize in custom EMI filter designs for switch mode power supplies, motor controllers, digital processors, power line feeds, power inverters, and signal line drivers and receivers. If you prefer an off-the-shelf EMI filter (which is often an acceptable way to go) we’ll help you select a filter that is appropriate for your application.

Robust circuit design is fundamental to electromagnetic compatibility. It is almost always more effective to implement EMI controls at the circuit-level than to try to add controls at higher levels, particularly for interface circuits. By controlling waveform spectral content conducted and radiated emissions are minimized, which reduces the need for filter assemblies and shielding.

We’ll work with your designers to help them implement electromagnetically quiet circuit designs that are hardened against radio frequency energy and transients.

Signal cables and power line cables are the most significant source of radiation from most electronic systems. The way cables are designed and assembled can have a profound effect on the electromagnetic characteristics of the product. Everything from the way shields are terminated to how cables are routed affects electromagnetic interference. We understand these effects will and help you design your cabling for compatible operation.

The way electronic circuits are packaged affects EMI as much as the electrical characteristics of the circuits. There is more to enclosure design than just shielding effectiveness. Let us show you how to optimize your electronic packaging.