Abstract:
A memory card substrate includes a first solder pad assembly formed on a top edge of the memory card substrate. The first solder pad assembly has multiple first solder pads equally spaced from each other and multiple first gaps each sandwiched between two adjacent first solder pads. A second solder pad assembly is formed on a bottom edge of the memory card substrate and has multiple second solder pads equally spaced from each other and multiple second gaps each sandwiched between two adjacent second solder pads. Each first solder pad corresponds to one of the second gaps so that the first solder pads are alternately arranged on the top edge relative to the second solder pads on the bottom edge.
Abstract:
A non-uniform transmission line includes at least one patterned conductive layer, a dielectric layer adjacent to the patterned conductive layer(s), and an insulating layer surrounding the patterned conductive layer(s) and the dielectric layer.
Abstract:
In a coupling adjusting structure for a double-tuned circuit according to the present invention, first and second coils are configured such that a pair of first conductive patterns formed on a first surface of a printed circuit and a corresponding pair of second conductive patterns formed on a second surface of the printed circuit board are connected via corresponding connecting conductors, thereby making the first and second coils low and thin. Also, one end of the first coil and the corresponding end of the second coil are disposed close to each other, a first ground conductive pattern is disposed at least on the first surface of the printed circuit, and a first jumper connected to the first ground conductive pattern is disposed between the first and second coils so as to adjust an inductive coupling of the double-tuned circuit, thereby achieving a coupling adjusting structure for a double-tuned circuit whose inductive coupling is adjustable.
Abstract:
A printed circuit board has two layers of printed circuit board dielectric material; a core made of ferromagnetic material between the two layers; and conductive leads on the opposite side of each dielectric layer from the core connected by via holes through both dielectric layers to form a conducting coil around the core. The conductive leads can form two separate coils around the core to form a transformer. A planar conducing sheet can be placed on or between one or more of the printed circuit board's dielectric layers to shield other circuitry on the printed circuit board from magnetic fields generated around the core. The core can be formed at least in part by electroless plating. Electroplating can be used to add a thicker layer of less conductive ferromagnetic material. Ferromagnetic inductive cores can be formed on the surface of a dielectric material by: dipping the surface of the dielectric in a solution containing catalytic metal particles having a slight dipole; and placing the dielectric in a metal salt to cause a layer containing metal to be electrolessly plated upon the dielectric. Plasma etching or other technique can be used before the dipping process to roughen the dielectric's surface to help attract the catalytic particles. This method can be used to form an inductor core on or between one or more dielectric layers of a printed circuit board, of a multichip module, of an integrated circuit, or of a micro-electromechanical device.
Abstract:
A subject of the present invention is to provide a clip-type lead frame having flexibility against a board thickness variation caused by not only an uneven product quality but also several different thick type products. To this end, the provided clip-type lead frame has a height adjustable means at lead pins corresponding to upper or/and lower side connection pads of the semiconductor device or the sub-board.
Abstract:
Methods and systems for reducing signal skew caused by dielectric material variations within one or more module substrates are described. In one embodiment, an elongate module substrate having a long axis includes multiple signal routing layers supported by the module substrate. Multiple devices, such as memory devices (e.g. DRAMs) are supported by the module substrate and are operably connected with the signal routing layers. Multiple skew-reducing locations (e.g. vias) within the module permit signals that are routed in two or more of the multiple signal routing layers to be switched to a different signal routing layer. The skew-reducing locations can be arranged in at least one line that is generally transverse the long axis of the module substrate. The lines of skew-reducing locations can be disposed at various locations on the module. For example, a line of skew-reducing locations can be disposed proximate the middle of the module to effectively offset skew. Multiple skew-reducing locations can be provided at other locations within the module as well so that the signals are switched multiple different times as they propagate through the module.
Abstract:
A subject of the present invention is to provide a clip-type lead frame having flexibility against a board thickness variation caused by not only an uneven product quality but also several different thick type products. To this end, the provided clip-type lead frame has a height adjustable means at lead pins corresponding to upper or/and lower side connection pads of the semiconductor device or the sub-board.
Abstract:
A series of plated through hole (PTH) vias are interconnected by traces that alternate between a top surface and a bottom surface of a dielectric board. The PTH vias in the series can be positioned to create a collinear inductive filter, a coil-type inductive filter, or a transformer. Multiple, electrically isolated series of interconnected PTH vias can be used as a multi-phase inductive filter in one embodiment. In another embodiment, multiple series of interconnected PTH vias are electrically connected by a linking portion of conductive material, resulting in a low-resistance inductive filter. Ferromagnetic material patterns can be embedded in the dielectric board to enhance the inductive characteristics of the interconnected via structures. In one embodiment, a closed-end pattern is provided with two series of interconnected vias coiling around the pattern, resulting in an embedded transformer structure. A method of producing an interconnected series of PTH vias includes providing a dielectric board having a series of holes. In some embodiments, the board includes an embedded ferromagnetic material pattern. The holes and the top and bottom surface of the dielectric board have a conductive material thereupon. Portions of the conductive material are selectively removed, resulting in the embedded inductive filter and/or transformer structure.
Abstract:
A wiring apparatus for reducing electromagnetic interference between conductive wires is provided. Wire pairs are incorporated into rigid or flexible printed circuits to precisely control loop alignment and phase differences. This precise alignment helps to cancel radiated electromagnetic fields and reduce voltage polarities induced in nearby wires. In one embodiment, a pair of parallel wires is aligned parallel to a second, twisted pair of wires. In another embodiment, two twisted pairs of wires, with identical loop lengths, are aligned parallel to each other and offset by exactly one half loop length. In a third embodiment, two twisted pairs of wires are aligned parallel to each other, in which one pair has a loop length that is an integer ratio of the other pair.
Abstract:
The present invention relates to the methods of construction for inductive components of, preferably, ferromagnetic materials such as inductors, chokes, and transformers when used as an integral part of the fabrication of PCB's or FLEX's. In one preferred embodiment, holes are formed through a ferromagnetic substrate and plated with conductive material. The arrangement of these holes, and the subsequent design that ensues, will form the inductive components within the plane of the media in which the device is formed; using the substrate for a magnetic core. By using this approach, the inductive components can be miniaturized to physical sizes compatible with the requirements of modem surface mount technology (SMT) for integrated circuitry (IC). This process also allows these components to be fabricated using mass production techniques, thereby avoiding the need to handle discrete devices during the manufacturing process. In another preferred embodiment, a series of thin, concentric high permeability rings are etched on a substrate to provide high permeability transformers and inductors having minimal eddy current effects.