Abstract:
A 3D electronic module including, in a direction referred to as the vertical direction, a stack of electronic dice, each die including at least one chip provided with interconnect pads, this stack being attached to an interconnect circuit for the module provided with connection bumps, the pads of each chip being connected by electrical bonding wires to vertical buses that are themselves electrically linked to the interconnect circuit for the module, a bonding wire and the vertical bus to which it is linked forming an electrical conductor between a pad of a chip and the interconnect circuit, wherein each electrical bonding wire is linked to its vertical bus by forming, in a vertical plane, an oblique angle and in that the length of the bonding wire between a pad of a chip of one die and the corresponding vertical bus is different than the length of the bonding wire between one and the same pad of a chip of another die and the corresponding vertical bus, and this is obtained by wiring the bonding wire in a non-rectilinear manner to compensate for the difference in vertical length of the vertical bus from one die to the other, such that the electrical conductor between the pad of a chip of one die and the interconnect circuit, and the electrical conductor between the same pad of a chip of the other die and the interconnect circuit, are the same length.
Abstract:
An electronic chip device with improved thermal resistance comprises at least one electrical connection pad with an electrical interconnection link, at least one thermal pad arranged on a face of the chip, at least one heat exchange element, and at least one thermal link between a thermal pad and a heat exchange element.
Abstract:
A method of collective fabrication of 3D electronic modules, each 3D electronic module comprising a stack of at least two, surface transferable, ball grid electronic packages, tested at their operating temperature and frequency comprises: a step of fabricating reconstituted wafers, each reconstituted wafer being fabricated according to the following sub-steps in the following order: A1)) the electronic packages are placed on a first sticky skin, balls side, B1) molding of the electronic packages in the resin and polymerization of the resin, to obtain the intermediate wafer, C1) thinning of the intermediate wafer on the face of the intermediate wafer opposite to the balls, D1) removal of the first sticky skin and placing of the intermediate wafer on a second sticky skin, side opposite to the balls, E1) thinning of the intermediate wafer on the balls side face, F1) formation of a balls side redistribution layer, G1) removal of the second sticky skin to obtain a reconstituted wafer of smaller thickness than the original thickness of the electronic packages, several reconstituted wafers having been obtained on completion of the previous sub-steps, stacking of the reconstituted wafers, dicing of the stacked reconstituted wafers to obtain 3D modules.
Abstract:
A liquid-phase process is provided for depositing metal layers in holes of an electronic module placed in a hermetic chamber, from a chemical liquid containing metal compounds intended to form a metal layer. The holes have a depth P and a diameter D such that D>80 μm and P/D>10, and the process comprises at least one cycle comprising the following substeps: M1) bringing the chamber to a preset pressure P0 and filling the chamber with the liquid; M2) degassing the holes by bringing the chamber to a low pressure P1, with P1
Abstract:
A method for collective fabrication of 3D electronic modules comprises: the fabrication of a stack of reconstructed wafers, comprising validated active components, this stack including a redistribution layer; the fabrication of a panel of validated passive printed circuits which comprises: fabrication of a panel of printed circuits, electrical testing of each printed circuit, fitting of the validated printed circuits to an adhesive substrate, moulding of the mounted circuits in an electrically insulating resin, called coating resin and polymerization of the resin, removal of the adhesive substrate, a panel comprising only validated printed circuits being thus obtained; bonding the panel with a stack (of reconstructed wafers); cutting the “stack of panel” assembly for the purpose of obtaining the 3D electronic modules.
Abstract:
The field of the invention is that of producing 3D electronic modules, compatible with components operating beyond 1 GHz. The invention relates to a 3D electronic module featuring an interconnection between a horizontal conductor and a vertical conductor to which it is connected exhibits, in a vertical plane, a non-zero curvature. It also relates to the associated production process.
Abstract:
A 3D electronic module comprises: two electrically tested electronic packages, each comprising at least one encapsulated chip and output balls on a single face of the package, referred to as the main face; two flexible circuits that are mechanically connected to one another, each being associated with a package, and which are positioned between the two packages, each flexible circuit comprising: on one face, first electrical interconnect pads facing the output balls of the associated package; at its end, a portion that is folded over a lateral face of the associated package; second electrical interconnect pads on the opposite face of this folded portion.