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Cover Story
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 | Considerations When Choosing High-Frequency Laminates
Choosing a laminate for a high-frequency printed circuit board (PCB) can impact the circuit fabrication process, the assembly process, and the end-use performance. For example, a material that is easy to process may not provide the best electrical performance. Selecting the right laminate for an application is a matter of understanding the requirements of a particular design project and the tradeoffs represented by different materials in terms of processing, fabrication, and end-use performance.
by John Coonrod
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 | Fine Lines in High Yield (Part CLXXVIll) Measuring and Controlling the Developer Chemistry
The
Tech Talk column has addressed dry film photoresist development
issues over the years (see Ref. 1-8) but it has not specifically
looked into how to measure and control the chemistry, nor has it
explained the significance of controlling parameters such as “active
carbonate,” “total carbonate,” and “resist loading.” So,
here is the long overdue discussion on developer chemistry control.
by Karl Dietz
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Conformal Coating at the Speed of Light: UV Conformal Coating from Start to Finish