emi

Since the discovery of electromagnetic interference (EMI) in the early 1900s, the need for testing for radiated emissions continues to grow as products get more complicated. The time to test has also grown, and, in some cases, can take days to complete. The introduction of fast Fourier transform (FFT) technology into EMI receivers can greatly decrease the required testing time, but is it applicable for everyone?

Commercial EMI testing requires strict pass/fail criteria with no allowances for upset. Military/aerospace susceptibility testing uses higher levels but allows more flexibility - equipment may be acceptable despite susceptibility at specific frequencies if those frequencies won't be encountered operationally, prioritizing practical deployment considerations.

In our increasingly electronic world, electromagnetic interference (EMI) poses a significant challenge to the reliability and performance of electronic devices. Shielding is a critical technique used in electromagnetic compatibility (EMC) to mitigate the effects of EMI. This article explores the concept of shielding, its importance in EMC, various shielding materials and their applications, and practical tips for designing effective shielding solutions.

This article explores a radiated emissions case where unexpected high-frequency noise appeared on low-speed I/O lines. The author discusses how power distribution network design issues can cause emissions problems and shares strategies for improving EMC performance through proper PCB layout.

Conventional wisdom attributes conducted EMI emissions solely to power connections, but interface-sourced common-mode potentials often masquerade as power terminal issues. Discover how to properly identify and address the true origins of your EMI challenges.

Explore the essential role of capacitors in electromagnetic interference (EMI) suppression. From ceramic to electrolytic options, discover how proper selection and placement of these components can significantly improve circuit performance and reliability in electronic design.

Got a noisy power system? This real-world EMI investigation reveals how seemingly minor grounding issues between compartments can create major interference problems - and shows how smart measurement techniques led to an elegant fix.

This Column discusses a technique for troubleshooting radiated immunity failures in electronic devices using near-field probes. It presents a case study, explains the method's application, and addresses its limitations and safety considerations for bench-level testing.

The month's Banana Skins covers various electromagnetic interference issues in different contexts. It discusses problems with video projectors affecting audio induction loops, switch-mode power supply emissions varying with voltage, hybrid vehicle EM emissions, computer interference with amateur radio, electrostatic discharge in fluid lines, and communication equipment in ambulances causing radio interference.

Understanding current flow patterns is crucial in EMC engineering, particularly the distinction between Common Mode and Differential Mode currents. Controlling current paths and providing local return paths helps reduce electromagnetic interference and improve immunity.