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EMC Concepts Explained

Impact of Decoupling Capacitors and Embedded Capacitance on Impedance of Power and Ground Planes: Part I

We investigate two four-layer PCBs with power and ground plane pairs spaced 3 mils and 30 mils apart.

Skin Depth in Good Conductors

This tutorial article focuses on the skin depth phenomenon in good conductors. We begin with the uniform plane propagation, leading to the wave equations and their solutions in different media.

EMC Filters Comparison Part II: π and T Filters

In this article the performance of the π and T filters is evaluated and compared to that of the CL and LC filters.

EMC Filters Comparison Part I: CL and LC Filters

This column discusses the second- and third-order low-pass EMC filters.

Sleeve Dipole Antenna Design and Build

This article describes a practical approach to the design and build of a sleeve dipole antenna mandated by a custom EMC standard.
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Balanced-Unbalanced Antenna Structures and Baluns

This article explains the operation of a balun that transforms an unbalanced antenna structure into a balanced one.

Impact of a Decoupling Capacitor in a CMOS Inverter Circuit

This article discusses CMOS inverter switching and shows the impact of a decoupling capacitor on the power rail signal integrity and radiated emissions.

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.

EMC Units in Measurements and Testing

This article reviews the decibel units used in EMC laboratory measurements and testing. We begin by defining a decibel (dB) unit and proceed to the EMC specific units for voltage, current, power, and impedance measurements.

Smith Chart Basics: Network Analyzer Calibration

Network analyzer measurements require the calibration procedure which utilizes a calibration kit, consisting of a short, open, and a 50 Ω load attachment.
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