Abstract:
An electrical connector for use in a power module includes a first end portion for forming an electrical connection with a substrate, a second end portion, and a compliant portion situated between the first end portion and the second end portion. The compliant portion includes a compressed position and a decompressed position. The first end portion is configured for forming an electrical connection with a substrate if the compliant portion is in the compressed position.
Abstract:
A computer system includes a microprocessor, an an input coupled to provide signal inputs to the microprocessor, a mass storage coupled to the microprocessor, a video controller for coupling the microprocessor to a display, a memory coupled to provide storage to facilitate execution of computer programs by the microprocessor, and a multilayer printed circuit board for mounting the microprocessor thereon. The multilayer printed circuit board provides for reduced electromagnetic interference (EMI) and includes at least two layers. The multilayer printed circuit board further includes a first conductive segment on a first layer, a second conductive segment on the first layer, the second segment being separated from the first segment by a primary gap, and a conductive interconnect on a second layer, the interconnect for carrying a high frequency signal therein. The second layer is disposed laterally from and substantially parallel to the first layer. The interconnect is further disposed for crossing over the first segment to the second segment in a cross-over region and wherein the first segment and the second segment are further characterized by a secondary gap in the cross-over region, the secondary gap being less than the primary gap for providing an increased coupling in the cross-over region. A method for reducing a source of EMI in a multilayer printed circuit board is also disclosed.
Abstract:
Noise frequency generated from a circuit is determined. The distance between two arbitrary lines of a plurality of power feed lines or a plurality of power return lines extending parallel to each other is determined on the basis of the determined noise frequency in question. The distance between jumper lines for bridging the two arbitrary lines is determined on the basis of the noise frequency, thereby suppressing emitted noise which can be generated on a printed circuit board.
Abstract:
A method and apparatus for drastically reducing timing uncertainties in clocked digital circuits simply, at virtually no cost, and using only standard clock drivers and simple, inexpensive electrical components is described. The method includes the steps of minimizing timing uncertainties by controlling both clock skew and clock jitter. Intrinsic clock skew is eliminated by ganging the outputs of a multi-line clock together onto a capacitive metal island disposed on a printed circuit board (PCB). Extrinsic clock skew is controlled through the use of wide, relatively high-capacitance traces of matched length and disposed on a single, common signal layer of the PCB, each leading to a respective receiver circuit and terminated identically. Clock jitter is controlled by electrically isolating a region of the PCB, disposing the clock driver in the region in such a way as to minimize noise, and providing quiet local power and ground to the region.
Abstract:
A face-mounting type memory module board wherein the number of through-holes is reduced by a large margin in order to improve the reliability of the board. V.sub.CC and V.sub.SS plates which have heretofore been provided inside a multi-layer wiring board are disposed on the reverse surface of a single-layer wiring board, and other wirings are disposed on its obverse surface by making use of a fine process, thereby greatly reducing the number of through-holes required.
Abstract:
A method of forming an electrical backplane comprising providing an initially oversized ground and potential plate, forming discontinuous slots in a staggered relationship near the edges of the top surface of one of the plates and the bottom surface of the other plates, laminating the plates together by filling the slots with insulative material and trimming the edge portions off by cutting through the filled slots and webs connecting the slots whereby exposed backplane edges lie opposite insulation in the slots of the plates.
Abstract:
An electronic control device includes a plurality of circuit boards that transmit signals to each other and a power supply connector for direct-current power. A ground line connected to a ground terminal of the power supply connector is connected to a ground of one of the plurality of circuit boards by way of a ground of another one of the plurality of circuit boards. In this way, the electronic control device including the plurality of circuit boards needs fewer noise reduction components while enabling easier routing of ground lines.
Abstract:
Provided is a printed circuit board having a breakdown detection pattern formed thereon for preventing illicit acquisition of sensitive data, the printed circuit board being configured so that false detection of a disconnection or a short in the breakdown detection pattern can be prevented. The printed circuit board (7) comprises a breakdown detection pattern layer (32) wherein a breakdown detection pattern is formed for detecting a disconnection and/or a shorting thereof, a first pattern layer (31) disposed more to a Y1 direction side than the breakdown detection pattern layer (32), a second pattern layer (33) disposed more to a Y2 direction side than the breakdown detection pattern layer (32), and signal pattern layers (34 to 36) disposed more to the Y2 direction side than the second pattern layer (33). Formed in the first pattern layer (31) are a grounding pattern and a power source pattern covering the breakdown detection pattern from the Y1 direction side. Formed in the second pattern layer (33) are a grounding pattern and a power source pattern covering the breakdown detection pattern from the Y2 direction side.
Abstract:
Embedding a discrete electrical device in a printed circuit board (PCB) includes: providing a vertical via as a blind hole from a horizontal surface of the PCB to an electrically conductive structure in a first layer, the first layer being one layer of a first core section of a plurality of core sections vertically arranged above each other, each core section including lower and upper conductive layers, and a non-conductive layer in between; inserting the electrical device into the via, with the device extending within at least two of the core sections; establishing a first electrical connection between a first electrical device contact device and the electrically conductive structure in the first layer; and establishing a second electrical connection between a second electrical device contact and a second layer, the second layer being one of the electrically conductive layers of a second horizontal core section.
Abstract:
Package substrates are provided. The package substrate may include a power line and a ground line on a first surface of a substrate body; a plurality of signal lines on the first surface between the power line and the ground line; and a lower ground pattern and a lower power pattern positioned on a second surface of the substrate body opposite to the first surface. The lower ground pattern may be disposed to be opposite to the power line and the lower power pattern may be disposed to be opposite to the ground line. Related semiconductor packages are also provided.