Abstract:
Pads are arranged as an integrated circuit (IC) footprint, and are formed in a stackup that includes an insulating layer and multiple signal routing layers. The footprint has a polygonal shape. There is an inner pad region, a middle pad region that surrounds the inner pad region, and an outer pad region that surrounds the middle pad region. Some of the pads of each pad region are connected to a respective group of signal lines. Some of the signals that are connected to pads of the outer region which are located in a corner of the polygonal shape are routed out of the footprint in a different layer than the one used to route signal lines that are connected to pads of the outer region which are located between two adjacent corners of the polygonal shape.
Abstract:
A technique for reducing the number of layers in a multilayer signal routing device is disclosed. In one particular exemplary embodiment, the technique may be realized as a method for reducing the number of layers in a multilayer signal routing device having a plurality of electrically conductive signal path layers for routing electrical signals to and from at least one electronic component mounted on a surface of the multilayer signal routing device. In such a case, the method comprises routing electrical signals on the plurality of electrically conductive signal path layers in the multilayer signal routing device for connection to and from a high density electrically conductive contact array package based at least in part upon at least one of an electrically conductive contact signal type characteristic and an electrically conductive contact signal direction characteristic.
Abstract:
A method of constructing an electric apparatus, comprising the following steps. First, a set of dielectric layers is provided. Next, a set of conductive features and at least one fiducial marking are formed on a first one of the dielectric layers, in mutual reference to each other so that their relative positions are known to a first tolerance. Then, a set of pin holes is formed in each dielectric layer, each pin hole formed in relation to the fiducial marking for its dielectric layer and all of the sets of pin holes having a mutually identical placement. Finally the dielectric layers are arranged onto a pin fixture having a set of pins that match the mutually identical placement of the pin holes.
Abstract:
A semiconductor electronic part, having a lot of bumps allocated in a checkered pattern, is solder-mounted on a multilayer circuit board. In the multilayer circuit board, a first wiring pattern linked with a first land is finer than a second wiring pattern linked with a second land. Only one first wiring pattern is passable between lands. The second lands are allocated in the outmost line on the uppermost layer of the multilayer circuit board. In the semiconductor electronic part, bumps connectable with the second lands are allocated in the outermost line.
Abstract:
A printed circuit board having an insulating board and a plurality of wiring patterns formed over the insulating board by screen printing and provided with first conductive pattern bent parts and wiring parts linked to the first conductive pattern bent parts. A pattern width in the first conductive pattern bent parts is greater than that of the patterns of those of the wiring parts positioned close to and on both sides of the first conductive pattern bent parts.
Abstract:
A wiring board for a semiconductor package comprises a base substrate having first and second surfaces; a wiring layer consisting of necessary wiring patterns formed on at least one of the first and second surfaces; a plurality of semiconductor element mounting areas formed on the surface of the base substrate on which the wiring layer is formed; and individual patterns as position information provided for the respective semiconductor element mounting areas, the individual patterns having a particular shape for the respective semiconductor element mounting area. The individual patterns as position information are formed on peripheral regions of the respective semiconductor element mounting areas.
Abstract:
A multi-layer circuit board for mounting an electronic part such as a semiconductor chip having as many pins as 40×40 pins arranged as an array on the side of the mounting surface or a semiconductor device has a plurality of layers, each layer disposed one above another and containing lands arranged as an array disposed at an angle to the edge of the mounting surface. On each layer a plurality of the lands have connected thereto circuits extending from the lands to the edge of the mounting surface, and also lands not connected to circuits. Those lands not connected to circuits are connected with via holes to orther layers. The numbers (n−2) of lands and the position of lands connected to circuits on a layer is defined where n is the smallest integer that satisfies the equation m≧(k+1) wherein m={(land pitch)×(n−1)−(land diameter)−(space between patterns)}÷(pattern width+space between patterns) and k=&agr;(n−1)+(n−2).
Abstract:
A BGA semiconductor package structure that is able to avoid high frequency interference has at least one non-ball mounting area on a bottom face of a substrate, wherein high frequency bump balls are mounted abreast on the non-ball mounting ball area. When the BGA package device is mounted on a PCB, the non-ball mounting area correspond the electric wires, such that the electric wires which are formed on the PCB are able to transmit high frequency signals and connect the high frequency bump balls. Thus, when the high frequency signals are transmitted via the electric wires, the high frequency signals do not affect other signals transmitted via other electric wires.
Abstract:
A printed circuit board is provided with a plurality of insulator layers and a plurality of conductor layers, and an outermost conductor layer has a plurality of foot patterns in outer and inner rows for mounting a BGA component and signal patterns. The width of at least a part of the signal pattern extending from the foot pattern in the outer row is greater than the width of the signal pattern extending from the foot pattern in the inner row. The printed circuit board further includes a protection layer for covering the signal patterns on the outermost conductor layer, and the protection layer has openings each for permitting the foot pattern to be exposed. At least a portion of the signal pattern appearing in the opening is widened.
Abstract:
A method of constructing a multilayer electric apparatus, comprising the steps of first providing a set of dielectric layers and forming a set of conductive features and at least one fiducial marking, in mutual reference to each other, on a first one of the dielectric layers. Next, the dielectric layers are joined together to form a stack, such that the first of the dielectric layers is interposed depthwise between others of the dielectric layers and the at least one fiducial marking is distinctly observable from outside of the stack. Finally, a via is drilled from the exterior of the stack to one of the conductive features of the first dielectric layer, referencing the drilling to the fiducial marking.