In this case study we're going look at some recent radiated emissions fault finding we performed for a customer. This highlights how one might go about the fault finding process, some of the considerations you might have when coming up with a solution, and how poor PCB layout can give you an emissions headache. Background A new customer discovered a radiated emissions problem … [Read more...]
Determining Semi-Anechoic Chamber Resonance as a Source of Radiated Emission Measurement Variation Between Chambers and Comparing to OATS Measurements
INTRODUCTION This article describes the lack of an acceptable correlation between anechoic chamber and open field test site radiated emission measurements, which were described in reference 1 in 2000, as well as a lack of correlation between chambers. It was found that emission measurements, which were over the limits in one facility, would pass in another. The lack of a … [Read more...]
Personal Protective Equipment (PPE) Evaluation Methods of Static Control Gloves for ESD Integrity
Static Control gloves can be classified as Personal Protective Equipment (PPE) to reduce the risk of electrostatic discharge (ESD). There are several types of ESD Gloves: Nitrile, Vinyl, Latex, Rubber and humidity independent conductive carbon/nylon yarn gloves as illustrated in Figure 1 above. Due to an astounding rise in the number of non-compliant and suspect … [Read more...]
Review: EMC – Methods, Analysis, Circuits, and Measurement
Electromagnetic Compatibility - Methods, Analysis, Circuits, and Measurement, David Weston, CRC Press, 2017 (3rd edition) While I've reviewed many books on EMC, this one by David A. Weston, is the most complete in coverage yet. The 1157-page book covers not only basic and advanced theory of EMC, but includes product design, commercial and military measurement techniques, and … [Read more...]
New Line of USB-Controlled Phase Locked Loop (PLL) Frequency Synthesizers
Pasternack, a leading provider of RF, microwave and millimeter wave products, has launched a new line of USB-controlled Phase Locked Loop (PLL) frequency synthesizers. In RF & Microwave communications systems where signal integrity is of prime importance, PLL synthesizers offer high levels of frequency stability and accuracy with exceptional phase noise characteristics … [Read more...]
New Edition of “EMC for Product Designers” Available Now
Now in its 5th edition, this text shows how to incorporate EMC principles in product design, avoiding cost and performance penalties to meet the needs of specific EMC compliance standards. A specific addition covers issues around functional safety. The book aims to present a complete introduction to EMC for product design,written by a practising consultant in the field. It … [Read more...]
Gaps In Return Planes – Bad News for EMI
Currently, there is an ongoing discussion among SI and EMC engineers on the fine points of PC board design for best signal integrity and EMI performance. Among the topics it seems designing in gaps or slits in ground return planes always comes up. Gaps can also occur mistakenly due to the addition of some connectors or other object that creates gaps in the copper. In fact, … [Read more...]
Frequently Asked Questions on Flexible Printed Circuits
Tech-Etch FAQ PDF on flexible circuits answers questions about manufacturing and designing circuits. What is a flexible printed circuit? What finishes are available for flex circuits? What are the benefits of flexible circuits over printed circuit boards? Can surface mount components be added to flexible circuits? What are the main markets and uses for high reliability flex … [Read more...]
Measuring Cable Resonances With A Comb Generator
(October 28, 2016) Cables are one of the key metallic structures on a product that can act as an antenna and couple energy, causing radiated emissions and possible compliance test failures. This has been discussed extensively in the literature on product design for EMI compliance. In many cases, they can resonate at their half-wave frequency and actually amplify any harmonic … [Read more...]
New Import Capability for Flexible Circuit 3D Simulation
Remcom has announced a new capability to import flexible printed circuit board (PCB) designs in the latest update to XFdtd® 3D Electromagnetic Simulation Software. The new release also includes Dielectric Volume Averaging and several usability conveniences. XFdtd’s PCB import dialog now includes the option to wrap a design, such as a flexible circuit, onto a form … [Read more...]
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