Abstract:
A telecommunications device including a plurality of splitter cards (55) mounted in a chassis (52). The device also includes a circuit board (68) and plurality of card edge connectors (96) for providing electrical connections between the splitter cards and the circuit board. The device further includes POTS connectors, LINE connectors and DATA connectors. The circuit board includes a first layer having first tracings that electrically connect contacts of at least one of the POTS, LINE or DATA connectors to at least one of the card edge connectors; a second layer having second tracings that electrically connect contacts of at least one of the POTS, LINE or DATA connectors to at least one of the card edge connectors; and a third layer having third tracings that electrically connect contacts of at least one of the POTS, LINE or DATA connectors to at least one of the card edge connectors. The second layer is positioned between the first and third layers. A majority of the second layer is covered by a grounding plane. The grounding plane and the second tracings are co-planar such that the grounding plane adds no additional thickness to the second layer. The grounding plane is positioned between the first and third tracings to reduce cross-talk between the first and third tracings.
Abstract:
A printed wiring board having assembled thereon a grid array type package, a multi-terminal device with many terminals arranged in matrix, is provided, through first signal connection holes, signal lines, and second connection holes, with many numbers of lands divided into plural blocks, being arranged in matrix on a first layer to connect each terminal of the multi-terminal device correspondingly, signal line patterns connected with many lands, and drawn out in the same direction per block, and first signal patterns from lands positioned on the innermost line of many lands. Then, the wiring patterns of the signal lines are drawn out regularly from many lands formed in matrix on the assembling surface of the grid array type package to make it easier for the printed wiring board to effectuate wiring connections without making them complicated or increasing the number of layers of the printed wiring board. Also, with the provision of ground patterns that surround signal lines, it is made possible to reduce unwanted radiation, as well as to suppress the occurrence of malfunctions of electronic equipment due to reflections and ground bounces.
Abstract:
In a multi-layered printed circuit board on which an LSI having a plurality of power supply pins and a plurality of signal pins is mounted, and a grid array package which adopts the printed circuit board, some or all of the plurality of power supply pins are connected to a power supply pattern via an inductance pattern, thereby reducing generation of radiation noise.
Abstract:
A printed circuit board ("PCB") includes a first pattern structure, a second pattern structure, a third pattern structure, and a fourth pattern structure. The first pattern structure includes a first ground pattern. The second pattern structure includes a first line pattern overlapping the first ground pattern and a second ground pattern electrically insulated from the first line pattern. The third pattern structure includes a third ground pattern overlapping the first line pattern and a second line pattern overlapping the second ground pattern. The fourth pattern structure includes a fourth ground pattern overlapping the second line pattern. Therefore, the PCB may decrease noise.
Abstract:
A system and/or method for sensing the presence of moisture (e.g., rain) and/or other material(s) on a window such as a vehicle window (e.g., vehicle windshield, sunroof or backlite). In certain example embodiments, a plurality of sensing capacitors are supported by a window such as a vehicle windshield, the capacitors each having a different field and/or pattern. A sensing circuit outputs an analog signal that is based on and/or related to the capacitances of one or more of the sensing capacitors. In certain example embodiments, a flexible printed circuit board (PCB) mountable in or on a vehicle window is provided. First and second sensing circuits are formed on opposing sides of the flexible PCB, with each said sensing circuit comprising a plurality of different fractal structures. A ground plane is located between the first and second sensing circuits, with the ground plane being arranged so as to decouple the first and second capacitor arrays and to shield the first capacitor array from fields emanating from the second capacitor array and vice versa. The electronic device is configured to detect moisture on an exterior surface of the vehicle window, humidity on an interior surface of the vehicle window, and EMI.
Abstract:
A printed circuit board ("PCB") includes a first pattern structure, a second pattern structure, a third pattern structure, and a fourth pattern structure. The first pattern structure includes a first ground pattern. The second pattern structure includes a first line pattern overlapping the first ground pattern and a second ground pattern electrically insulated from the first line pattern. The third pattern structure includes a third ground pattern overlapping the first line pattern and a second line pattern overlapping the second ground pattern. The fourth pattern structure includes a fourth ground pattern overlapping the second line pattern. Therefore, the PCB may decrease noise.
Abstract:
A hybrid assembly having improved cross talk characteristics comprises a substrate (101) having an upper surface (111). Conductive paths on the upper surface are provided for conducting high frequency signals. Regular polygons (501, 503) made of an electromagnetic band gap (EBG) material having slow wave characteristics are 5 deposited on the upper surface and form a lattice for tessellating the upper surface. Each of the polygons has a periphery. The polygons are separated along their periphery from adjacent polygons by an interspace and are covered with an insulating material. Second polygons (804,808), also made of an electromagnetic band gap material, are deposited over the insulating material. Vias (828) connect second polygons 10 to ground plane(307). Semiconductor structures (404,406) are mounted over the second polygons. The semiconductor structures have a plurality of electrical contacts with the conductive paths. The regular polygons can be hexagons, triangles, octagons or any other combination that forms a lattice and can be printed onto the substrate.