Measurement uncertainty for common-mode disturbances can be reduced from about 22 dB to a maximum of a few dB. Mart Coenen Philips Applied Technologies, Eindhoven, the Netherlands INTRODUCTION In early 1980, extensive discussions were held within the IEC CISPR/A working group regarding the definition of the impedance characteristics and the RF emission limits attained via … [Read more...]
Power Quality Effects on the Reliability and Susceptibility of EMI Filters
EMI filter performance plays a critical role in limiting emissions and also impacts the immunity of end-use equipment to electrical disturbances. Philip F. Keebler and Kermit O. Phipps EPRI, Knoxville, Tenn., USA Today, electronic equipment is commonplace in every residential, commercial, and industrial environment. Moreover, this equipment depends on increasingly complex … [Read more...]
Reverberation Chamber for EMC Testing
The reverberation chamber provides the most realistic simulation/equivalency for electronics functioning within a cavity. Er-Ping Li and Xing-Chang Wei Electromagnetic Labs, Institute of High Performance Computing, Singapore INTRODUCTION The problem is familiar, but growing. The widespread and ever-growing use of electronic devices with high-speed components increases the … [Read more...]
Multi-Channel Filter Arrays Feature Ultra-Compact Packaging
EMI filters in ultra-compact LLP leadless packages are available from Vishay Intertechnology. These arrays are the 4-channel VEMI45AA-HNH, the 6-channel VEMI65AA-HCI, and the 8-channel VEMI85AA-HGK. With a low profile of 0.6 mm and a pin-to-pin pitch of 0.4 mm, these VEMI filter arrays have been crafted to conserve board space and to provide EMI/ESD protection in portable … [Read more...]
Understanding Inductance in the Real-World
As soon as current flows through metal conductors, inductance exists. Bruce Archambeault, Ph.D. IBM Distinguished Engineer, IBM, Research Triangle Park, NC, USA The concept of inductance is one of the most misunderstood concepts in electrical engineering. Terms such as ‘self inductance’, ‘loop inductance’, ‘partial inductance’, ‘mutual inductance’ are used with little … [Read more...]
Antenna Fundamentals
A proper understanding of antennas requires familiarity with electromagnetics, circuit theory, electronics and signal processing. Candace Suriano, Ph.D., Suriano Solutions John Suriano, Ph.D., Nidec Motors, Auburn Hills, MI, USA Tom Holmes, Agilent Technologies, Tipp City, OH, USA Qin Yu, Alcatel-Lucent, Columbus, OH, USA How does an antenna pick up a signal and convert it to … [Read more...]
Magnetic Shielding Basics
Growing complexity in electronics heightens the need for magnetic shielding. Richard Vance Ad-Vance Magnetics, Inc., Rochester, IN, USA Without magnetic shielding, much of today’s sophisticated electronic gear would be larger, less efficient, and in some magnetic environments, completely non-functional. Today’s complex components are extremely sensitive, and miniaturization … [Read more...]
Board-Level Multi-Cavity Shielding
Photo-chemical machining offers significant advantages over traditional methods of manufacture. Alan Warner TECAN Components Ltd., Weymouth, UK The ever-increasing demands on RF and microwave circuitry design and development teams to achieve EMC, eliminate crosstalk, save PCB real estate, decrease overall product size, provide access for rework and, last but not least, reduce … [Read more...]
Certification Programs: What’s Behind the Terminology?
The Merriam-Webster® Dictionary defines “certify” as “to attest authoritatively, to confirm, to present in a formal communication, or to attest as being true.” Consider the implications of these words and phrases—confirm, attest, true, or meeting a standard. These are serious statements. These terms are typically used by laboratories when they refer to data they are providing … [Read more...]
Interference Suppression Using a Balanced MLCC
An innovative capacitor design can provide more RFI suppression in a substantially smaller package Steve Weir and James Muccioli X2Y Attenuators, LLC Erie, PA Instrumentation amplifiers are often employed in hostile noise environments. Sensor lead cables may pick up substantial RF radiation, particularly if they are long and/or not well shielded. When applied to the input of … [Read more...]
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