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Electrical characterization of quad-flat-paks (QFPs) using frequency-domain techniques

Quad-Flat-Paks (QFPs) are difficult to measure and model at high frequencies because they lack power and ground planes. By fixturing the package and establishing a ground reference the problem becomes much more manageable. Measurements are made with a network analyzer because it clearly reveals high-frequency effects. By measuring and simulating the different configurations (open, short, and thru) all the elements in the circuit can be extracted with great accuracy.