Reading time ( words)
I was first introduced to James Maxwell in 1967 as a college student. I had to decide whether I would take the Maxwell fields course or the switching and coding course. Being a chemical engineering major with a co-major in control theory, I had heard about the trials and tribulations of the infamous Maxwell fields course.
After a lot of consideration, I decided to take the switching and coding course, since it was more related to computer theory, while the fields course was more related to RF, power generation/distribution, and communications.
In those days, our transistors, tubes and ICs were still pretty slow, except for radio, radar, etc. At that time, signal integrity in board layout was not an issue. I was using RTL, DTL and slow TTL logic on breadboards of non-plated through-holes with tinned-copper wire and Teflon spaghetti tubing.
But after talking with students who had managed to successfully pass the fields course, I was awed by the mathematical rigors they had endured. I was astounded when these very same students found thermodynamics so difficult. Maxwell’s eqations are not easy.
To read this entire article, which appeared in the November issue of Design007 Magazine, click here.
Nolan Johnson, I-Connect007
There’s designing the “perfect” circuit board and then there’s designing a board that is “perfect for manufacturing.” While seasoned designers and design engineers understand many of the nuances, PCB fabricator Sunstone Circuits has just published a new book specifically for new designers who have the knowledge of design but are still learning what it means to get the board manufactured. Sunstone’s Matt Stevenson takes the reader through a series of situations that should help clarify what’s happening in the fabrication process and how to adjust a board design to be better suited for manufacturing.
Cherie Litson, CID+, Litson1 Consulting
HDI—high-density interconnect—designs require some different thinking on the part of the designer. One of the first things to consider is whether you need HDI, and if so, how much. The HDI option comes into play as soon as you purchase any components with 0.5 mm pin pitch. The number of these components and other specifications of your design will determine the amount of HDI you will need. Here’s a quick list of HDI options.
Andy Shaughnessy, Design007 Magazine
To get the latest news about ultra high-density interconnections (UHDI), we checked in with Jan Pedersen, NCAB Group’s director of technology. Jan is co-chair of IPC D-33AP, and a great source of overall DFM expertise as well. We asked him to give us a snapshot of UHDI in the industry, where we’re headed, and what this means to PCB designers.