Common mode coupling mechanism on AC/DC converter.
In a previous article, I discussed the common mode coupling on the PoE (Power Over Ethernet) DCDC converter that I discussed a few months...
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EMC Consutancy & Design solutions
Francesco Poderico
Nov 27, 20222 min read
EMC issues due to optoisolators.
EMC is considered by many to be a "black magic" for a number of reasons. In some cases, it may be the case that you obtain unexpected...
1,4920
Francesco Poderico
Nov 23, 20222 min read
Common mode emission on card extensions and ground bouncing.
Today, it is common for a product to contain a motherboard and several daughter boards. In the following example, let us imagine that we...
6171
Francesco Poderico
Nov 20, 20223 min read
Precautions I take when using metallic enclosures
A couple of months ago, I was testing EMC for a medical product. As the product is enclosed within a metallic enclosure, I was concerned...
7030
Francesco Poderico
Nov 16, 20222 min read
The insulation transformer Nightmare.
I visited Scotland on holiday, a beautiful country! There is so much history in Edinburgh, and I also enjoyed visiting Glasgow. It is...
910
Francesco Poderico
Nov 14, 20223 min read
Mixed designs with ADC and DAC require some precautions.
A few years ago, I worked on digital radio for a customer. It was a very complex design, but the reward for an electronic engineer such...
971
Francesco Poderico
Nov 12, 20223 min read
How I control even and odd harmonics on a clock trace.
Some time ago, I wrote a blog post about the design technique I use when I am solving EMC emissions for clients when I am working on...
2880
Francesco Poderico
Nov 11, 20223 min read
Diodes and operational amplifier from an EMC perspective.
Those of you who are reading my post know that there is not much 'black magic' behind EMC and that there is always an explanation for why...
2270
Francesco Poderico
Nov 11, 20222 min read
Routing strategy when changing layer.
I designed my first general I/O PCI card when I was a student (a few years ago now :-)). The PCI card was part of my thesis, and the...
2110
Francesco Poderico
Nov 11, 20222 min read
Some analysis I do when I design a DCDC converter. (Part 4)
As we have seen in parts 1, 2, and 3, the input current loop of a DCDC converter affects both conductive and radiated emissions....
1300
Francesco Poderico
Nov 11, 20223 min read
Some analysis I do when I design a DCDC converter. (Part 3)
In the process of creating a new product from scratch, I always add components that I may not need in production when I am designing it....
980
Francesco Poderico
Nov 11, 20221 min read
PCB Crosstalk and how to use the ground plane to minimise it.
To avoid EMI and crosstalk on both PCB traces and connectors, it is crucial to understand the return path current. Previously, I...
1090
Francesco Poderico
Nov 11, 20223 min read
Some analysis I do when I design a DCDC converter. (Part 2)
I had the pleasure of working with a customer a few years ago, who was ready to launch his product on the market. My suggestion was to go...
1050
Francesco Poderico
Nov 7, 20223 min read
The importance of designing the return current properly and why it is so critical!
It was my pleasure to assist a startup company in passing EMC last month. The company now has its CE mark on their product and I am...
750
Francesco Poderico
Nov 3, 20222 min read
The analysis I do when designing a DCDC converter. (Part 1)
When we design electronics, there are a few things we shouldn't skip. Often, CEOs and CTOs pressure us to design things quickly. But what...
1960
Francesco Poderico
Oct 26, 20222 min read
Placement of vias on bypass capacitors.
When we place our bypass capacitors on a PCB, there are several factors that may affect the series inductance of the capacitor ESL when...
1040
Francesco Poderico
Oct 23, 20222 min read
Problems associated with input ceramic capacitors.
I spent several stimulating days last week performing EMC testing on one of my most challenging designs in the past two years. This is...
540
Francesco Poderico
Oct 22, 20222 min read
Why do we need the ground/power planes!
Recently, a customer contacted me about the possibility of "fixing" their design from the standpoint of EMC. The board may function...
1170
Francesco Poderico
Oct 21, 20222 min read
The Galvanic corrosion on PCB
Have you ever seen corrosion on the solder joints on an old PCB? Or on the aluminium side of a power supply? Why we do have corrosion,...
370
Francesco Poderico
Oct 7, 20222 min read
EMC is not E=mc² Part 3
A few years ago I was doing EMC testing for a product I designed myself. The emissions were so low that at some point the EMC house...
660
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