Abstract: A multi-chip module (10) has a plurality of functional circuits each disposed within its own cavity (15-18), each cavity separated from the other by isolation channels (20, 21). Each functional circuit includes a plurality of monolithic microwave or high speed digital integrated circuit chips (29-33) which are wire bonded or flip-chip attached to the multi-chip module, and each is encapsulated in plastic (37) overmold compound. Complete electromagnetic shielding is provided by depositing metal (23) over the channels and the plastic encapsulation, thereby providing a totally electromagnetically channelized and shielded multi-circuit, microwave and/or high speed digital integrated circuit board.

Abstract: An improved surface mount package and method of making such a package is provided. A conventional surface mount package is modified by fabricating a U-shaped via around the lead via to form a quasi-coaxial transmission line through the insulating substrate. This permits the electrical impedance in the conductive elements of the surface mount package to be controlled to reduce insertion loss and return loss, and to improve isolation. The surface mount package includes a lead frame, and a gold plate to which an integrated circuit in the package is attached. The package is sealed with a ring-frame and a lid. Ground vias connecting the lead-frame to the plate through the substrate may also be included. The present package is designed by modelling the various elements of the package as a coaxial transmission line, a co-planar waveguide, and a single lead in a trough transmission line in combination.

Abstract: An improved surface mount package and method of making such a package is provided. A conventional surface mount package is modified by fabricating a U-shaped via around the lead via to form a quasi-coaxial transmission line through the insulating substrate. This permits the electrical impedance in the conductive elements of the surface mount package to be controlled to reduce insertion loss and return loss, and to improve isolation. The surface mount package includes a lead frame, and a gold plate to which an integrated circuit in the package is attached. The package is sealed with a ring-frame and a lid. Ground vias connecting the lead-frame to the plate through the substrate may also be included. The present package is designed by modelling the various elements of the package as a coaxial transmission line, a co-planar waveguide, and a single lead in a trough transmission line in combination.