MWagner_MA

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Sr. Electronics Engineer

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MWagner_MA

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  • 07.12.2017
  • Samsung recall analysis: form factors and battery reliability
  • What I tend to observe these days is engineers under time pressure, and then using the "fingers crossed" method of insuring reliability. Not until a failure occurs can a suggested "design for manufacturing" feature, that costs, be implemented. As fewer management teams originate from the engineering ranks (practicing engineers), their only point of reference is the $$$$. Expect more of this from time to time. "Murphy" is alive and well.
  • 07.11.2017
  • An IBIS-AMI Simulator for the rest of us
  • Can't wait to try it out. Can it also export or convert the IBIS model to a SPICE model? I"m looking to extract a behavioral model of mixed signal components for noise modeling and optimization. Straight analog parts can be straight forward, but digital parts are harder to model the effect of signal noise, and that from the power rail. I was thinking that IBIS models may prove to be a useful tool for this.
  • 07.11.2017
  • Optimizing snubber design through frequency-domain analysis
  • I lost interest as soon as I see: "Here’s a simple and accurate...". That is a college professor mistake. It is up to the reader to decide if you method is easy or difficult for THEM. By the way, you launch in to describing a measurement method and then start speaking of simulation. A very confusing article.
  • 06.26.2017
  • Electronics interference: LG displays and routers
  • Thanks Brian for the detail in the article. The overall skill level of EE's is dropping as companies show a disdain for experience. EMI regs are seemingly treated as a "formality" rather than a tool to make a product more reliable. Masher's comments are a little scary, as a pilot, the last thing you need is comm problems on approach in a busy terminal area.
  • 05.26.2017
  • Is iPad scope worth professional pricetag?
  • Welcome to the "makers" thinking their professional engineers. 16K of memory, what are we using a Commodore 64? Obviously the concept of "aliasing" among other terms is foreign to them. When I see omissions like this you have to wonder about how solid the rest of the engineering was to build the product. If if you ignore the market research - anyone with experience using digital O-Scopes know you need a LOT more than that. Even 100K, as I have seen on some other recent offerings, is way too small. Thanks for the detailed review Mike.
  • 01.31.2017
  • If it smells fake, it probably is
  • Martin, how true. We are constantly pushing our marketing department to establish requirements or boundaries of what they expect our products to do. Marketers naturally don't want to do that because,then they may have to say "no, we can't do that" to a potential customer. Instead, they try to push fuzzy specs, then rail at engineering to make the product work for this one customer. Sound familiar? Reputable companies drive a stake in the sand and state what you can expect from a product time and again.
  • 01.06.2017
  • Properly ground your circuits
  • With all due respect to the authors as renowned experts in the field, the statement "A PCB does not need an analog ground plane and a digital ground plane" is accurate when only 1 or two supplies are used. When there are multiple supplies that are isolated, it is best to focus on return currents as the article mentions. Splitting planes is necessary to avoid RF leakage paths, and the overlapping of such planes is closely controlled as well. I like to avoid the NEVER, and ALWAYS statements as it usually is impractical to state all the assumptions that the statement is predicated on. I'm a big fan and have been a student of your work for years. Thanks for your contributions to the field.
  • 12.29.2016
  • Near-field scanning: useful or misleading?
  • thanks Ken. My confusion was caused by the fact that by using the probes mentioned, the signal has already radiated. So my question then becomes how to consider the threshold for a "problem" to occur at a distance. Noise currents through a decoupling capacitor will not radiate (much) because the loop areas, if properly designed, will prohibit that from occurring.
  • 12.29.2016
  • Near-field scanning: useful or misleading?
  • So where would you go to understand more about understanding what will propagate, and what will not? Specifically, I would like to understand how this consideration would apply in PCB design. (nice article thanks!)