Semiconductor die shrinking means that 0.7ns risetimes are now too slow Electrostatic discharges in the real world cover a very wide range: from relatively slow high-voltage events (say, > 1kV peak) to extremely fast low-voltage events (say, < 1kV peak). The figure shown is of the transient field radiated by a micro-gap discharge between two coins – more on this … [Read more...]
Ground / Power Bounce Cause Noise Emissions From All IC Pins
Ground and power bounce are often ignored as sources of CM noise emitted from all integrated circuit (IC) pins, even if they are static inputs or outputs, digital or analogue, and even sometimes emitted as radiated noise directly from the body of the IC (especially when its physical structure resonates). CMOS ICs use ‘totem-pole’ logic switching gates that momentarily short … [Read more...]
For Remote Patient Monitoring Systems, Wireless Coexistence Can Be Lifesaving
The demand for wireless medical applications such as remote patient monitoring, real-time diagnostic analysis, smart surgical systems, and implantable sensors have grown significantly over the last couple of years. Thanks to implanted medical devices, many patients live an almost normal life without having their mobility compromised. Popular implants include cardiac pacemakers, … [Read more...]
Don’t Rely on the Stability of the Mains Frequency
My old colleague and good friend Tim Williams sent me the story below for inclusion in EMI Stories/Banana Skins, and I found it so interesting in so many ways that I decided to publish it as a Blog. In so very many EMC standards and other meetings on EMC, we hear that the stability of the AC mains power frequency is either ‘not an EMC issue’ or is ‘never a real EMC … [Read more...]
MIL-STD-461G Implications with RE102 Changes
Introduction: MIL-STD-461G was issued in December 2015 incorporating many changes throughout the document prompting user questions or interpretations. Laboratory situations arise where the generic guidance requires specific situational decisions and the most common tests such as RE102 are included. The user quickly realizes that the given direction does not make sense for a … [Read more...]
Visualize, Localize and Troubleshoot EMI Signals with Real Time Spectral Analysis
The following transcript and video were originally presented at EMC LIVE 2016 by Lee Hill. For access and information on all EMC LIVE events, both past and present, please visit https://emc.live/. Kenneth Wyatt: Hello, and welcome to EMC Live 2016. This presentation is about visualizing, localizing and troubleshooting EMI signals with real time spectral analysis. I'm … [Read more...]
EMC Question for 400Hz Power System
Question: I would appreciate it if you could provide your view / share your expertise on the EMC/EMI protection requirements between the 400Hz Ground Power Systems and the various ICT/ELV installations within an Aircraft. Answer: An interesting and important question! And much too big an issue to be able to deal with comprehensively, in a blog post. The … [Read more...]
Under the Medical Safety Standard IEC 60601-1-1:2014 an EMC Test Lab is not Required to Assess or Review Any Aspect of a Risk Management File
Note: This content was originally posted in January 2020 on emcstandards.co.uk. IEC 60601-1-2:2014 is a medical device safety standard that deals with safety risks that can be caused by electromagnetic interference with electronics. It is not an EMC compliance standard! If the EMC test lab has the necessary safety risk assessment competencies, they could review/assess the … [Read more...]
MIL-STD-461G Passive Device Calibration Review
The Requirement: When MIL-STD-461 revision “G” was issued, I believed that the answer to many of my measurement equipment calibration issues had been solved. Right there in the “Calibration of measuring equipment” paragraph the requirements clearly stated: After the initial calibration passive devices such as measurement system antennas, current probes, and LISNs, require no … [Read more...]
Demystifying EMC in an Electric Vehicle’s Drive Unit
1. Introduction The past decade has witnessed both a leap forward in technology and market expansion of the global electric vehicle (EV) industry [1]. With Tesla leading the market, followed by traditional vehicle original equipment manufacturers (OEMs) such as Volkswagen, PSA, and Toyota, to name just a few, the electrification of the automotive industry has been advancing at … [Read more...]
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