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Design007-Apr2021

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64 DESIGN007 MAGAZINE I APRIL 2021 Why is embedded resistor technology con- sidered to be "new" and "growing" despite decades of history? In fact, a broad number of established PCB fabricators are knowledgeable about the mate- rials and processes for embedding resistor elements but not all may be prepared to alter procedures established for their more conven- tional multilayer circuit board customer base. e next question is, "What is the motiva- tion for embedding resistors?" • PCB densification—a primary driver • Functionality—a contributor • Performance—an enhancement • PCB assembly—simplified e primary benefit of embedding resistor elements within the layers of the multilayer PCB is the ability to more efficiently arrange and interconnect the primary active compo- nents placed on the outer surface of the circuit boards surface. Furthermore, embedding most of the passive components can contribute to the development of a more robust PCB assem- bly, one that will not be physically impacted by environmental extremes or when the end product is exposed to excessive vibration and shock. Additionally, incorporating these pas- sive resistor elements within the circuit board structure simplifies the logistics required for procurement, stocking, and assembly process- ing for multitudes of damage-prone ceramic- based components. A key issue facing the PCB designer is to determine which resistors will be more suit- able for embedding within the circuit board's structure and which resistor elements are more appropriate for placement onto the cir- cuit board's outer surface. e printed board designer really acts as the facilitator and is Embedding Resistor Elements, Part 1 Designers Notebook by Vern Solberg, CONSULTANT

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