Abstract:
A semiconductor system having a substrate (101) including a rigid insulating interposer (110) with a high modulus and a top (140) and a bottom (150) low-modulus tape with flip-attached semiconductor chips (120, 130). The assembled chips, with the passive surfaces facing each other, are located in an opening (114) of the interposer, which has a thickness (111) equal to or smaller than the sum of the assembled two chips. Adhesive material (160) holds the tapes parallel to the interposer and the chip surfaces together. Solder balls (180) and discrete components (170) may be attached to the outside surfaces of the tapes.
Abstract:
An electronic assembly (10) is disclosed. The electronic assembly (10) includes a lower portion (28) and a first elongate trace (32) formed on an upper surface of the lower portion (28). The trace (32) is covered by an upper portion (26), and an opening (18) formed through an upper surface of the upper portion (26) extends to the trace (32) to expose a portion of the trace (32). A second elongate trace (20) is formed on the upper portion (26). A portion of the second elongate trace (20) positioned in the opening (18) formed through the upper surface of the upper portion (26) contacts the first elongate trace (32) through the opening (18) to form an electrical interconnection (46) between the first trace (32) and the second trace (20).
Abstract:
An apparatus that includes a plurality of metalized planes, one or more dielectric layers separating the plurality of metalized planes and one or more conductive trenches connecting to at least one of the plurality of metalized planes.
Abstract:
A laminated board comprising an insulating layer having both a strength suitable for a structural body and a machinability good enough to make a via hole therein. The laminated board comprises an insulating layer and a conductive layer. The insulating layer includes a simple layer in close contact with the conductive layer and containing a resin component not containing inorganic long fibers and a composite layer in close contact with the opposite side of the simple layer to the conductive layer and containing a resin component and an organic long fiber component. The laminated board has a bottomed hole extending through the insulating layer, having its bottom which is the conductive layer, and made by a laser beam.
Abstract:
A polymer film is applied onto a surface of a laminated printed circuit board subassembly having vias. Holes are created in the polymer film to access the vias while the polymer film remains covering adjacent areas. The polymer film with holes allows placement of hole-fill paste in the vias while preventing unwanted hole-fill paste placement or migration to adjacent areas. After filling the vias with hole-fill paste, the hole-fill paste is preferably at least partially hardened or cured, and the polymer film is preferably removed, facilitating further assembly of a printed circuit board without unwanted hole-fill paste in other areas which could be difficult to remove, The invention includes improved processes for fabricating printed circuit boards, and is particularly useful for irregular circuit boards and rigid flex circuit boards. The invention also includes covered laminated printed circuit board subassemblies, covered with a removable polymer film.