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Frequency content of digital signals in PCB interconnects increased up to 40-50 GHz in recent years. To ensure that interconnects work as expected over this bandwidth, we have to build validation boards. This paper reports lessons learned from a validation projects with the goal to build formal procedure for systematic prediction of interconnect behavior up to 40 GHz. We will go through selection of test structures, connectors and measurement equipment, demonstrate uncertainties of the analysis based on the initial pre-manufacturing assumptions and how closer to reality we get with more formal approach based on material model and manufacturer adjustments identification.
Learn how to design the PCB interconnects that match the expectations and correlate with reality. Learn how to design a validation board right the first time. Learn elements of the formal approach to PCB interconnect design based on dielectric and conductor roughness models and manufacturer adjustments identification.