current

Military and Aerospace EMC: The Currents of EMI

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.

Conducted Emissions Feedback from VSD-Operated Products

The ubiquitous increase in the use of mains power switching devices has been paralleled by the increase in nuisance tripping of GFCIs and other protection devices. Nuisance tripping can be identified to contain such high frequency signals and these must be properly taken into account when designing proper GFCI operation in this environment.

PCB Return-Current Distribution in a Microstrip Line

This article discusses the distribution of a PCB return current underneath top trace for the microstrip configuration. Next month’s article will discuss the distribution for the stripline configurations.

Common-Mode Current Creation and Suppression

This article discusses the creation of a common-mode current in a typical circuit and explains the effectiveness of a common-mode choke on differential-mode and common-mode currents.

Nanomagnetic Devices and the Zero Field Switching Effect

Scientists have discovered a surprising phenomenon that could result in smaller, lower-power memory and computing devices.
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Transients Created by High di/dt and Inductive Loads

When switches interrupt current through inductive loads, the results can be destructive — high-voltage spikes, HF ringing, and arcing that threatens both components and nearby circuits. This article breaks down the physics behind these transients and demonstrates practical, low-cost protection strategies.

Conducted Emissions Measurements: Current Method

Current conducted‑emissions measurement practices under DO‑160 and CISPR 25 rely on shielded‑enclosure testing, LISNs, and current probes to evaluate RF noise on power lines. This overview walks through setups, limits, and real measurement results for both aerospace and automotive environments.

Because It’s All About the Current

A 1988 study of current distribution in printed circuit boards reveals how return‑current paths, ground‑plane impedance, and trace coupling drive EMI and signal‑integrity issues. Its insights on low‑impedance ground structures remain foundational for today’s high‑speed digital designs.

I’m Partial to Partial Inductance!

1409 F2 coverIt is well known (but often forgotten) that the concept of inductance, without defining a complete loop of current, is completely meaningless! Some books give inductance of a length or wire, some people talk about the inductance of a via, and still others talk about the inductance of ground braids, etc. All these discussions about inductance ignore the requirement for a complete loop before the total or loop inductance can be discussed in any meaningful way.

Resistor Value for Measuring Leakage Current

Furor and controversy are words which describe the process by which standards committees decide the value of the resistor in the leakage current measuring network. However, the different specified resistor values create no more than a 6.25% error for the value of the leakage current.
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