Abstract:
Methods of operating a base station serving a cell in a heterogeneous network and at least one relay node serving a subcell of the cell, in which a user equipment unit connects to the network via the base station or the relay node, are provided. The methods include receiving uplink access (Uu) signals at the relay node from the user equipment unit in a first frequency range, and transmitting uplink backhaul (Un) signals from the relay node to the base station in a second frequency range that is different from the first frequency range.
Abstract:
A reworkable epoxy underfill is provided for use in an electronic packaged system which incorporates an integrated circuit, an organic printed wire board, and at least one eutectic solder joint formed therebetween. An exemplary embodiment of the encapsulant includes: a cycloaliphatic epoxide; an organic hardener; and a curing accelerator; wherein said cycloaliphatic epoxide includes a carbonate or carbamate group. The encapsulant can also include a filler, such as a silica filler. A method is also provided for forming the aforementioned reworkable epoxy underfills.
Abstract:
A detachment apparatus for detaching at least one component (120) from a circuit board (125) can include a shaft (105) configured to rotate about a central axis, at least one lever (110) having a first end and a second end, the lever being attached to the shaft at the first end, and a hook (115) attached to the second end of the lever. Rotation of the shaft causes the hook to come into contact with the component on the circuit board, and the hook is configured to separate the component from the circuit board.
Abstract:
Die vorliegende Erfindung betrifft ein Verfahren zum Austausch eines Halbleiterchips eines solchen Flip-Chip-Moduls sowie ein geeignetes Flip-Chip-Modul und eine Vorrichtung zum Ausführen des Verfahrens. Das Flip-Chip-Modul umfasst zumindest einen Halbleiterchip und ein Substrat. Der Halbleiterchip weist an einer Oberfläche etwa senkrecht zur Oberfläche angeordnete Kontaktsäulen auf. Mit diesen Kontaktsäulen ist er über eine Lötverbindung mit Kontaktstellen des Substrates verbunden. Die Kontaktsäulen überdecken mit ihren Stirnflächen die Kontaktstellen vollständig. Hierdurch ist es möglich, das Lot zwischen den Kontaktsäulen und Kontaktstellen nach einem erneuten Erwärmen vollständig aus dem Zwischenbereich zwischen den Kontaktstellen und den Kontaktsäulen zu drücken. Dies erlaubt eine erneute Befestigung eines weiteren Halbleiterchips.
Abstract:
A method of removing solder (60) from an area grid array pad (52) by applying a wire mesh (14) to a conductive surface (54) of the area grid array (52) that is covered with solder (60). Heat is applied to the wire mesh (14) and the conductive surface (54) of the area grid array (52) so that the solder (60) flows from the conductive surface (54) onto the wire mesh (14). The wire mesh (14) is removed from the conductive surface (54) thereby removing all solder (60) from the conductive surface (54) of the area grid array (52).
Abstract:
Methods, systems and devices are disclosed for performing a semiconductor processing operation. In some embodiments this includes configuring a wire bonding machine to perform customized movements with a capillary tool of the wire bonding machine, etching bulk contaminants over one or more locations of a semiconductor device with the capillary tool, and applying plasma to the semiconductor device to remove residual contaminants.
Abstract:
A method of printing transferable components includes pressing a stamp (10) including at least one transferable semiconductor component (20) thereon on a target substrate (30) such that the at least one transferable component and a surface of the target substrate contact opposite surfaces of a conductive eutectic layer (31). During pressing of the stamp on the target substrate, the at least one transferable component is exposed to electromagnetic radiation (4) that is directed through the transfer stamp to reflow the eutectic layer. The stamp is then separated from the target substrate to delaminate the at least one transferable component from the stamp and print the at least one transferable component onto the surface of the target substrate. Related systems and methods are also discussed.