Abstract:
In the preferred embodiment, there is disclosed a printed circuit board having a surface providing a mating interface to which is electrically connected an electrical connector having signal conductors and ground conductors. The printed circuit board includes a plurality of stacked dielectric layers, with a conductor disposed on at least one of the plurality of dielectric layers. The mating interface includes a plurality of conductive vias aligned in a plurality of rows, with the plurality of conductive vias extending through at least a portion of the plurality of dielectric layers, at least one of the plurality of conductive vias intersecting the conductor. The plurality of conductive vias includes signal conductor connecting conductive vias and ground conductor connecting conductive vias. For each of the plurality of rows of the conductive vias, there are at least twice as many ground conductor connecting conductive vias as signal conductor connecting conductive vias and the conductive vias are positioned relative to one another so that for each signal conductor connecting conductive via, there are ground conductor connecting conductive vias adjacent either side of the signal conductor connecting conductive via.
Abstract:
In a high-frequency switching module for use mainly in a communications apparatus and a high-frequency apparatus equipped with the same, the high-frequency switching module has a group of high-frequency terminals provided on the mounting side surface of a multi-layer assembly of which the lateral sides are formed as no-electrode provided sides excluding the high-frequency terminals. Thus, the high-frequency switching module and the high-frequency apparatus equipped with the same are less susceptible to the external effect.
Abstract:
A method is provided for designing a computer assembly. This may include obtaining a design of the computer assembly having a transmission line and a connection portion, and matching an impedance value of the transmission line to an impedance value of the connection portion so as to obtain a desired filter characteristic. A computer assembly may also be provided that includes a motherboard, a module and a transmission line. A connection transition may be designed such that an impedance of the transmission line matches an impedance of the connection transition and to obtain a desired filter characteristic.
Abstract:
A method and apparatus for supporting a microelectronic substrate. The apparatus can include a microelectronic substrate and a support member carrying the microelectronic substrate. The apparatus can further include a first connection structure carried by the support member. The first connection structure can have a first bond site configured to receive a flowable conductive material, and can further have at least two first elongated members connected and extending outwardly from the first bond site. Each first elongated member can be configured to receive at least a portion of the flowable conductive material from the first bond site, with none of the first elongated members being electrically coupled to the microelectronic substrate. The assembly can further include a second connection structure that is electrically coupled to the microelectronic substrate and that can include second elongated members extending away from a second bond site. The number of second elongated members can be equal to the number of first elongated members.
Abstract:
A ceramic capacitor having a ceramic body and terminal electrodes, the ceramic body being substantially a rectangular parallelopiped in shape, the terminal electrodes being provided at the two ends of the ceramic body in the length direction, each terminal electrode being provided to cover one end face of the ceramic body in the length direction, part of the two surfaces in the width direction, and part of the two surfaces in the thickness direction, wherein, when the length of the ceramic body is L1 and the maximum lengths of the terminal electrodes at the two surfaces of the ceramic body in the width direction are L3 and L4, 0≦|(L4−L3|/L1≦0.0227 is satisfied. One surface among the two surfaces of the ceramic body in the width direction is the paste introduction side in the roller coating, while the other surface is the paste escape side in the roller coating.
Abstract:
A solder ball pad for mounting and connecting of electronic devices and, more particularly, apparatus and methods providing an improved solder ball pad structure on a substrate, such as a printed circuit board (“PCB”) or a semiconductor die, while enabling better use of the spaces between adjacent solder ball pads and at the same time providing increased surface area for bonding to a solder ball. Substrates, electronic device assemblies and systems incorporating the invention are also disclosed. The inventive solder ball pad structure comprises a metal pad layer that is partially exposed by an aperture in an insulative mask layer, but not exposing any surrounding substrate surface, an optional metallic or polymer interface layer formed onto at least a portion of the exposed area of the metal pad layer and onto at least a portion of a sidewall of the solder mask formed by the aperture as well as extending onto the top surface of the solder mask, a copper layer formed onto the interface layer (if used), and extending up the vertical wall and out over the top surface of the solder mask, followed by nickel and gold layers to enhance the wettability of the resulting solder ball pad surface.
Abstract:
In a circuit board including a pad for mounting a ball grid array and a wiring, a mounting structure of the ball grid array, an electro-optic device, and an electronic device, the circuit board includes a pad for mounting the ball grid array, a wiring for connecting the pad and an external terminal, and a soldering resist having an opening portion exposing the pad and the wiring.
Abstract:
Disclosed is an improved printed circuit board having circuit patterns printed thereon. It has a plurality of composite lands each including a first land having a terminal hole made at its center for inserting the terminal of a selected electric or electronic part or device, and a plurality of second lands each being contiguous to and extending outwards from the first land. The areas contiguous to the contours of the first and second lands have no conductive foils such as copper foils to expose the substrate surface of the printed circuit board. The exposed areas are effective to confine the thermal energy in the limited areas for soldering. And the composite land shape defines a ridged cone like solder lump, which can fixedly grip the terminal of the part or device.
Abstract:
A connector pad includes projections extending radially outwardly from an inner portion of the pad to help stabilize and reinforce the pad. The added stability allows the radial thickness of an inner portion of the pad to be reduced. This decreases the surface area of the pad and reduces the opportunity for capacitive build up to occur relative to an associated conductive plane in a circuit board.
Abstract:
Disclosed are a chip scale package and a method of fabricating the chip scale package. The chip scale package comprises a first and a second conductive layers formed on insulating layer and spaced from each other by a designated distance so as to be connected to each of two terminals, a third conductive layer formed on the second surface of the chip so as to be connected to the terminal of the second surface of the chip, and electrode surfaces formed on each of designated side surfaces of the first, the second, and the third conductive layers. The chip scale package is miniaturized in the whole package size. Further, the method of fabricating the chip scale package does not require a wire-bonding step or a via hole forming step, thereby simplifying the fabrication process of the chip scale package and improving the reliability of the chip scale package.