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...]
Simulation in EMC
INTRODUCTION Digitization and the spread of pervasive computing is at the forefront of the technology innovation that will shape our modern universe and it is already manifesting itself in IoT, 5G and autonomous vehicle spaces, to name just a few areas. As this spread of technology increases, so does the need to regulate it – in terms of how these devices and systems … [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...]
EMC Radiated Emission Measurements at 1/3/5/10/30 Meters
INTRODUCTION There are two principal types of emission measurements in the world of electromagnetic compatibility, conducted emission and radiated emission. The conducted emission measurements are either a voltage-capacitive tap type of measurement (typically on a power line) or they are a current-clamp type of measurement (typically on a signal line). Radiated emission … [Read more...]
Resilience is Key to the Connected and Autonomous Revolution
INTRODUCTION Connected and autonomous vehicles have long been hailed as the answer to safe transport. Around 1.25 million people die in road traffic accidents worldwide each year according to E&T– and driver error accounts for over 90 per cent of those deaths[1]. In theory, the removal of the driver as the lead decision maker for vehicle control should reduce this number, … [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...]
Top Three EMI and Power Integrity Problems with On-Board DC-DC Converters and LDO Regulators
Co-authored by: Kenneth Wyatt and Steve Sandler INTRODUCTION Modern devices are continuing a long-term trend of squeezing more electronics into smaller packages, while also increasing system performance, data rates and operating efficiency. Higher efficiencies are often achieved by implementing faster silicon MOSFETs or even faster eGaN FETs while size is reduced by … [Read more...]
The CE Mark Process for Electronic Hardware Manufacturers
Introduction Navigating the CE Mark process can be a challenge for both startups and experienced manufacturers alike. This article is a guide for hardware manufacturers who want to do all the right things to legally get their product into Europe. Here’s what we’re going to cover: The typical CE Marking process for electronic equipment Outline of the most common … [Read more...]
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