OK, this is not a book for the faint-hearted. Bogdan Adamczyk is a professor of engineering and the founder of the EMC Center at Grand Valley State University in Grand Rapids, MI. As such his recent book, Foundations of Electromagnetic Compatibility with Practical Applications (Wiley 2017, ISBN 978-1-119-12078-0) is crammed with derivations of basic electromagnetic … [Read more...]
Troubleshooting Radiated Immunity for Medical Products – Case Study
Introduction Companies making medical products have much more stringent requirements now that the new IEC 60601-1-2 (Edition 4) became effective June 17, 2017. One of the many changes included increased radiated immunity requirements in several specific wireless and communications bands (Table 1). Highlights of all the changes are included in Interference Technology’s free … [Read more...]
An Engineering Ethics Question for Today
I’ve been presenting a seminar on engineering ethics to students in the Electrical Engineering Department at Washington State University for a number of years. I’ve started off with a video of the Challenger explosion and the questions leading up to it as expressed by Roger Boisjoly, a Morton Thiokol engineer. Roger Boisjoly had studied data showing that the field joint … [Read more...]
Joining the New Defense Acquisition University (DAU) Spectrum & EM Compliance Community of Practice (CoP)
The Defense Spectrum Office has sponsored for many years, the Spectrum and EM Compliance Special Interest Area on the DAU’s Acquisition Community Connection (ACC) portal. This Community of Practice (CoP) serves as a platform to connect Spectrum and E3 Compliance practitioners from across multiple career fields, offering them a chance to talk, share, and acquire knowledge about … [Read more...]
Selecting the Proper EMI Filter Circuit For Military and Defense Applications
Introduction Insertion loss, the term used to express a filter’s ability to reduce or attenuate unwanted signals, has traditionally been measured in a 50 ohm source and 50 ohm load impedance condition, as standardized in MIL-STD-220. In this matched 50 ohm impedance condition, various types of filter circuit configurations, single capacitor, “L’s”, “PI’s”, and “T’s”, will … [Read more...]
Simulating EM Shielding for Aeronautical Applications
The airframe of an aircraft can provide some measure of shielding against high-intensity radiated fields (HIRF), but this is compromised by doors, windows, seams, access panels and components interfaced to the airframe such as antennas used for communication and navigation. Composite materials are increasingly used in aeronautical applications due to their relatively light … [Read more...]
Choosing and Using Silicon Protection Devices
Introduction Correctly choosing an external (off chip) Transient Voltage Suppressor (TVS) is not as simple as it once was. Integrated Circuit (IC) feature size is shrinking (Figure 1) and more and more inputs are being exposed to the outside world. Portable consumer devices are everywhere and have more functions in smaller and smaller sizes, necessitating smaller and smaller … [Read more...]
Review: TPI-1001-B RF Synthesizer
I recently had the chance to review a new RF signal generator from Trinity Power Inc. Their model TPI-1001-B is much more than just a mere synthesizer. This improved model also includes several modulations as well as scalar analysis (a "poor man's" network analyzer). The product (Figure 1) is available from RF design consultant, Robert Yarbrough … [Read more...]
New Line of Flat Wire Inductors Introduced
ITG Electronics, a leading manufacturer of inductors and transformers in business since 1963, now offers a range common footprints as well as custom flat wire inductors for high power density and high frequency switching. As the name suggests, flat wire inductors utilize a flattened, rectangular cross section, copper wire instead of a traditional, circular cross section, … [Read more...]
Input Filters – The Key to Successful EMC Validation
Co-authored by: Ranjith Bramanpalli & Steffen Schulze Würth Elektronik INTRODUCTION Input filters are today as ever a requisite factor for successful EMC validation of switching controllers, irrespective of the size of the AC component involved. Switching controllers create conducted EMC interferences due to AC components in their lines, independent of their individual … [Read more...]
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