Abstract:
A hybrid electromagnetic bandgap (EBG) structure for broadband suppression of noise on printed wiring boards includes an array of coplanar patches interconnected into a grid by series inductances, and a corresponding array of shunt LC networks connecting the coplanar patches to a second conductive plane. This combination of series inductances and shunt resonant vias lowers the cutoff frequency for the fundamental stopband. The series inductances and shunt capacitances may be implemented using surface mount component technology, or printed traces. Patches may also be interconnected by coplanar coupled transmission lines. The even and odd mode impedances of the coupled lines may be increased by forming slots in the second conductive plane disposed opposite to the transmission line, lowering the cutoff frequency and increasing the bandwidth of the fundamental stopband. Coplanar EBG structures may be integrated into power distribution networks of printed wiring boards for broadband suppression of electromagnetic noise.
Abstract:
A capacitor structure is provided. In the capacitor structure, a signal electrode plate and an extension ground electrode plate are disposed on the same plane to form a co-plane capacitor structure. Due to slow wave characteristic, the resonance frequency of the capacitor structure is effectively raised and the capacitor structure may be applied in high frequency.
Abstract:
A wired circuit board is provided having a high-reliability conductive pattern formed thereon and mounting an electronic component thereon with high accuracy, and a method is provided for manufacturing the wired circuit board and mounting the electronic component thereon. An insulating layer including a mounting portion is formed on a metal supporting layer having a specular gloss of 150 to 500% at an incidence angle of 45°. A conductive pattern is formed on the insulating layer. By a reflection-type optical sensor, a defective shape of the conductive pattern is inspected. Then, an opening is formed by etching the portion of the metal supporting layer which is overlapping the mounting portion such that the mounting portion of the insulating layer exposed by etching has a haze value of 20 to 50%, whereby a TAB tape carrier is obtained. Thereafter, an electronic component is aligned with the mounting portion by a reflection-type optical sensor such that the electronic component is mounted on the mounting portion.
Abstract:
A wired circuit board assembly sheet having a plurality of wired circuit boards, distinguishing marks for distinguishing defectiveness of the wired circuit boards, and a supporting sheet for supporting the plurality of wired circuit boards and the distinguishing marks. Each of the distinguishing marks has an indication portion for indicating a specified wired circuit board.
Abstract:
An electrical connection structure allowing reduction in height and easy disassembly, wherein a first connecting member comprises a flexible substrate comprising a flexible insulating film, at least one conductive pad formed on at least one side thereof, a conductive circuit pattern extending from the rim of the pad, a through-hole formed through the thickness thereof at a planar position within the pad, and a small aperture formed at a planar position within the pad and communicating with the through-hole, and a second connecting member comprises a conductive projection formed at least one side thereof and electrically connected with a conductive circuit pattern formed inside or on the second connecting member, where the electrical connection is formed in the manner such that the conductive projection is inserted in the through-hole, through the small aperture, and mechanically contacts the pad.
Abstract:
Magnetic field distribution and mutual capacitance control for transmission lines are provided. A first circuit board is fabricated by attaching a reference plane layer to a dielectric material layer, and attaching a first trace to the second surface of the dielectric material. A surface profile of the reference plane layer is modified to decrease a resistance of a return current signal path through the reference plane layer, to reduce a magnetic field coupling between the first trace and a second trace. A second circuit board is fabricated by attaching a reference plane layer to a dielectric material layer, attaching a trace to the dielectric material, and forming a solder mask layer on the dielectric material layer over the trace. An effective dielectric constant of the solder mask layer is modified to reduce or increase a mutual capacitance between the first trace and a second trace on the dielectric material.
Abstract:
A semiconductor package board for mounting thereon a semiconductor chip includes a metal base having an opening for receiving therein the semiconductor chip and a multilayer wiring film layered onto the metal base. The semiconductor chip is flip-chip bonded onto the metal pads disposed on the multilayer wiring film within the opening. The surface of the metal base is flush with the top surface of the semiconductor chip received in the opening. The resultant semiconductor device has a larger number of external pins and a smaller deformation without using a stiffener.
Abstract:
A mounting region is provided at an approximately center of one surface of an insulating layer. A conductive trace is formed so as to outwardly extend from inside of the mounting region. A cover insulating layer is formed in a periphery of the mounting region so as to cover the conductive trace. A terminal of the conductive trace is arranged in the mounting region, and a bump of an electronic component is bonded to the terminal. A metal layer made of copper, for example, is provided on the other surface of the insulating layer. A pair of slits is formed in the metal layer such that a region being opposite to the electronic component is sandwiched therebetween. Each slit is formed so as not to divide the metal layer into a plurality of regions.
Abstract:
Coupling reliability of a passive component is improved to increase the reliability of a semiconductor device. A first through hole is formed in a first electrode part of a first plate-like lead, and a second through hole is formed in a second electrode part of a second plate-like lead. As a result, at the first electrode part of the first plate-like lead, one external terminal of the passive component can be coupled to the first electrode parts on both sides of the first through hole while being laid across the first through hole. Also, at the second electrode part of the second plate-like lead, the other external terminal of the passive component can be coupled to the second electrode parts on both sides of the second through hole while being laid across the second through hole. Accordingly, at central portions both in the longitudinal and width directions of the passive component, the passive component is surrounded by sealing members. As a result, thermal stress applied to jointing materials such as solder can be reduced, improving the reliability of the semiconductor device (semiconductor package).
Abstract:
A method of making a circuitized substrate which involves forming a plurality of individual film resistors having approximate resistance values as part of at least one circuit of the substrate, measuring the resistance of a representative (sample) resistor to define its resistance, utilizing these measurements to determine the corresponding precise width of other, remaining film resistors located in a defined proximity relative to the representative resistor such that these remaining film resistors will include a defined resistance value, and then selectively isolating defined portions of the resistive material of these remaining film resistors while simultaneously defining the precise width of the resistive material in order that these film resistors will possess the defined resistance.