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OLL-623 Accurate PCB Transmission Line Characterization

OLL-623 Accurate PCB Transmission Line Characterization

Learn how to get the most out of your TDR for precision measurements of the time delay, dielectric constant and characteristic impedance of transmission lines in printed circuit boards. We describe good measurement and fixturing techniques to get time delay and dielectric constant measurements accurate to a few percent. For microstrip traces, we show how to convert the effective dielectric constant measurement into the bulk dielectric constant measurement. The most common artifacts in impedance measurements related to lossy cables are revealed and two techniques to avoid them are detailed.

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