Abstract:
The method of producing a multilayer circuit board includes a film-forming step of forming a swellable resin film on the surface of an insulative substrate, a circuit groove-forming step of forming circuit grooves having a depth equal to or greater than the thickness of the swellable resin film on the external surface of the swellable resin film, a catalyst-depositing step of depositing a plating catalyst on the surface of the circuit grooves and the surface of the swellable resin film, a film-separating step of swelling the swellable resin film with a particular liquid and then separating the swollen resin film, and a plating processing step of forming an electrolessly plated film only in the region where the plating catalyst or the plating catalyst formed from the plating catalyst precursor remains unseparated after separation of the swellable resin film.
Abstract:
A substrate, and a semiconductor die package formed therefrom, are disclosed which include a distributed plating pattern for reducing mechanical stress on the semiconductor die. The substrate according to embodiments of the invention may include traces and contact pads plated in a double image plating process. Additionally, the substrate may include dummy plating areas including plating material. The plated vias and/or traces and the plating material within the dummy plating areas provide a plating pattern which is evenly distributed across the surface of the substrate. The even distribution of the plating pattern prevents peaks and valleys in the finished substrate.
Abstract:
A passive impedance equalization network (250,255,260,265) for high speed serial links is described. The impedance equalization network may include at least one stepped impedance transformer near points of impedance discontinuities (205,225,210,230). The impedance discontinuities may be at an interface connection between two circuit boards. The impedance discontinuities on a circuit board may be at a die-package interface and/or a package-board interface. The stepped impedance transformer may be formed in a package trace, a board trace or both. Forming the stepped impedance transformers in the traces requires no modification to existing package/board design methodology or technology. The stepped impedance transformers can provide impedance matching over a range of frequencies. To account for modeling errors in the design of the stepped impedance transformers integrated circuits transmitting data over the serial link may include active circuitry to select an output/input impedance for transmitters/receivers. Other embodiments are otherwise disclosed herein.
Abstract:
A method of forming a flexible conductive strip includes: molding a continuous, flexible base of an electrically insulating thermoplastic resin, while forming channels in a surface of the base; at least partially filling the formed channels with a flowable, electrically conductive composition; and then stabilizing the flowable composition in the channels to form a pattern of stable, electrically conductive traces within the channels. A method of forming a flexible circuit board having loop-engageable touch fastener elements includes: molding a continuous, flexible base from an electrically insulating thermoplastic resin, while forming a field of stems integrally molded with and extending from a first side of the base; applying a conductive material to the base to form a pattern of electrically conductive traces in accordance with a circuit design; and forming loop-engageable heads on the stems.
Abstract:
A power transfer pad, having: a non-conductive board having a top and a bottom; a plurality of conductive substrate sections disposed across the top of the non-conductive board; at least one conducting element disposed on each of the conductive substrate sections; a plurality of electrical contacts on the bottom of the non-conductive board, wherein each of the electrical contacts on the bottom of the non-conductive board are in electrical communication with one of the conductive substrate sections on the top of the non-conductive board.
Abstract:
It is intended to further increase the strength against bending or twisting of the boundary between a flexible wiring board cover film and a metal band while retaining the bending easiness and minimizing an increase in the size of the flexible wiring board. Specifically, a plurality of rows of metal bands 12b formed in a stripe pattern on the flexible wiring board are shaped to have an increased width or thickness only in the vicinity of boundaries B1, B2 exposed from a cover film 12a, and the length H2 of a portion where such width or thickness is varied is increased gradually from the outer to the inner row.
Abstract:
Upper, inner and lower sections (182, 180 and 184) of a PCB (100) are formed with each section having a substrate (140, 150 and 160) having patterned layers of metallization (105 and 110, 115 and 120, and 125 and 130), respectively. Some of the patterned layers of metallization (110, 115, 120, and 125) have thicker portions (171, 173) and part (188) of portion (186), and thinner portions (172, 174, 187, 190, 191, 192 and 193). The resultant thinner portion (175 and 194) in the prepreg layers (145 and 155) with the respective thicker portions of metallization provide decoupling capacitors, while the resultant thicker portions (196 and 198), for example, provide a lower capacitance for improved trace impedance for the signal traces (191 and 192).