Electrical characterization of quad flat non-lead package for RFIC applications

The QFN package is a near chip scale package plastic encapsulated package with a coppery leadframe substrate. The purpose of this paper was to establish the wideband equivalent circuit model of QFN packages for RF applications. Only short-path configuration was required for S-parameter measurement to achieve this purpose. The comparison of S11 and S21 between S-parameter measurement and optimized equivalent circuit model verified that those results were well matched and optimized. The parasitic parameters of equivalent circuit were reliable up to 6 GHz. The methods proposed in this paper may reduce the cost for samples preparation and chip simulation run time.