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Interference Technology

For EMI / EMC Engineers

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In Memory of Bob Goldblum

 

Good morning. My name is Graham Kilshaw and it is my honor to offer this eulogy in honor of my father in law – Bob Goldblum. It was only 35 degrees outside when Bob was born, December 18, 1935 in Philadelphia, and the economy wasn’t that warm either. After all, most of the country was considered far from comfortable at that time. The Wall Street Crash had occurred just 6 … [Read more...]

Ten Tips to Minimize EMI from On-Board DC-DC Converters

 

It is fairly common to find multiple onboard DC-DC converters on today's portable, mobile, and IoT devices. If the device uses wireless, GPS, or cellular technologies, the EMI from these converters (which generally use switching frequencies between 1 and 3 MHz) often interferes with the receiver performance of the wireless modules. The problem really crops up for low-band … [Read more...]

Introduction to Specifying RF/Microwave Power Amplifiers for EMC Testing

 

Can you imagine a world without electronic devices? AR asks and answers this question in its new blog series: “Specifying RF/Microwave Power Amplifiers for EMC Testing.” Explosive growth in technologies like portable electronics, Internet-of-Things devices, and autonomous vehicles has led to a world full of electromagnetic interference. Efficient EMC testing is more critical … [Read more...]

Review of MIL-STD-461 CS116 Damped Sinusoidal Transients, Cables and Power Leads

 

Introduction In this article, I am delving into the evolvement of CS116 testing, the background, the purpose and how the testing is approached today. The test title is, “Conducted Susceptibility, Damped Sinusoidal Transients, Cables and Power Leads”. MIL-STD-461 assigns applicability to a broad variety of applications and states the purpose is to verify the ability of the … [Read more...]

Review of MIL-STD-461 RE103 Antenna Spurious and Harmonic Outputs

 

Introduction Technology frequently embeds transmitters in a myriad of devices to support an Internet Of Things (IoT) concept from identification to condition-based actions, and this IoT approach includes defense operations. Devices may include multiple transmitters that a few years ago did not include communications of any sort. Inclusion of RF transmitters has prompted a … [Read more...]

Review of MIL-STD-461 CS115 Impulse Excitation; CS109 Structure Current; RS105 Transient Electromagnetic Field

 

Introduction I realized earlier that my reviews have covered most of the MIL-STD-461 test methods in the past year, so I decided to prepare this to capture those items that have been omitted in prior articles. Since this is a series close out and the topics have little in common, I’ll take on each instead of using commonality to group multiple test methods. CS115 – … [Read more...]

Be Careful with Low Cost/Quality Common Mode Chokes ….

 

Dear readers, I have been really busy working in training and EMI troubleshooting in the past months. I am happy to be here again with a new post. This month we will see a topic from a real-world situation - very interesting - for electronic designers working in conducted emissions problems. In one of the projects I was involved with several weeks ago, a product was … [Read more...]

Review of MIL-STD-461 CS103 Intermodulation, CS104 Rejection of Undesired Signals and CS105 Cross-Modulation

 

Introduction  Rapid technology advances in the wireless communications world make test and evaluation of Radio Frequency (RF) devices a difficult subject. It seems that by the time a new device hits the market, it has been made obsolete by the next generation. I recall hearing from a major electronics manufacturer CEO that 90% of sales happen within 90-days of market release … [Read more...]

Electrostatic Discharge (ESD) in Electro-Optic Devices

 

Many electronic components used in highly technological devices can be damaged or degraded by sudden electrostatic discharges, known by the term Electrostatic Discharge (ESD). Components such as transistors, diodes, laser diodes, electro-optical devices, and a variety of integrated circuits are all sensitive to electrostatic discharge. Many manufacturers are increasingly … [Read more...]

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