Abstract:
An FPC connected to a piezoelectric actuator has a board and two driver ICs mounted on the board. The board is provided with two wires for transmitting two kinds of mode selection signals respectively corresponding to two kinds of driving modes and with a selection pad selecting one from the two kinds of mode selection signals transmitted through the two wires and then outputting the selected signal to each driver IC.
Abstract:
Integrate circuit die terminal arrangements and configurations for mounting an integrate circuit die on a package substrate to reduce package transmission paths. In one embodiment, terminals for signals sensitive to trace length outside a die are arranged at the corners of the die. The die is mounted on a package substrate in an angle with respect to a package substrate to point the corners of the die at the edges of the package substrate to reduce trace length outside the die. The center of the die may or may not coincide with the center of the substrate. In one embodiment, when compare to a centered, non-rotated die mounting position, mounting a die with corners pointing at the edges of the package substrate does not cause significant differences in substrate warpage.
Abstract:
An alphanumeric display includes a substrate that has top and bottom surfaces, a plurality of electrical contacts on the top surface, a plurality of light-emitting electronic devices mounted on the top surface, and a plurality of electrical pads on the bottom surface. The electrical contacts are connected to at least one light-emitting electronic device, and each of the light-emitting electronic devices is electrically connected with corresponding ones of the electrical contacts. The electrical pads are electrically connected to corresponding ones of the electrical contacts for communicating to the light-emitting electronic devices external sources of electrical power and control signals. The electrical pads on the bottom surface are arranged in a pattern to facilitate connections to the device using a conductive adhesive.
Abstract:
Disclosed are methodologies for defining matched-impedance footprints on a substrate such as a printed circuit board, for example, that is adapted to receive an electrical component having an arrangement of terminal leads. Such a footprint may include an arrangement of electrically-conductive pads and an arrangement of electrically-conductive vias. The via arrangement may differ from the pad arrangement. The vias may be arranged to increase routing density, while limiting cross-talk and providing for matched impedance between the component and the substrate. The via arrangement may be altered to achieve a desired routing density on a layer of the board. Increasing the routing density may decrease the number of board layers, which tends to decrease capacitance and thereby increase impedance. Ground vias and signal vias may be arranged with respect to one another in such a manner as to affect impedance. Thus, the via arrangement may be altered to achieve an impedance that matches the impedance of the component. The via arrangement may be also be altered to limit cross-talk among neighboring signal conductors. Thus, the via arrangement may be defined to balance the impedance, cross-talk, and routing density requirements of the system.
Abstract:
The through holes in an array manner in the signal layer within the chip-interposed region on a substrate of a BGA package comprise a ball pads array having a plurality of ball pads and a vias array. The vias array has a plurality of vias located interlaces with the ball pads array. The outermost portions of the chip-interposed region are designed in such a manner to have at least two rings of vias for signal transmission and power connection. The interval between every two adjacent vias in the ring is not less than twice of the distance of two ball pads. Upon such an arrangement, the BGA package can have a plurality of dissipation channels that can increase dissipation space, dissipate quickly the heat generated from the IC, and transmit well for signal and power.
Abstract:
A sub-mount adapted for AC and DC operation of devices mountable thereon, the sub-mount including a base substrate including a first surface and a second surface different from the first surface, a conductive pattern on the first surface, a first pair and a second pair of first and second electrodes on the second surface, and vias extending through the base substrate between the first and second surfaces, wherein the conductive pattern includes a first set of mounting portions and two via portions along a first electrical path between the first pair of first and second electrodes, and a second set of mounting portions and two via portions along a second electrical path between the second pair of first and second electrodes, the via portions connecting respective portions of the conductive pattern to respective electrodes of the first and second pair of first and second electrodes through the vias.
Abstract:
A method of making an electronic package which includes a circuitized substrate having at least two electrical components positioned thereon. The package includes patterns of contact sites, each for having one of the components coupled thereto. The patterns of contact sites in turn are electrically interconnected by a grouping of conductive lines which, to substantially prevent skew, are of substantially the same length. The method involves forming the line patterns in such a manner so as to reduce line skew.
Abstract:
In the present electronic structure, a substrate is provided in the form of a circuit board. First and second electronic devices are positioned on opposite sides of the circuit board, each having a plurality of contacts connected to the circuit board. Each of the contacts of the first device is connected to a contact of the second device by a connector though the circuit board. At least one of the contacts of the first device is connected to the contact of the second device which is most adjacent to that contact of the first device across the circuit board.
Abstract:
A pattern matched pair of a front metal interconnect layer and a back metal interconnect layer having matched thermal expansion coefficients are provided for a reduced warp packaging substrate. Metal interconnect layers containing a high density of wiring and complex patterns are first developed so that interconnect structures for signal transmission are optimized for electrical performance. Metal interconnect layers containing a low density wiring and relatively simple patterns are then modified to match the pattern of a mirror image metal interconnect layer located on the opposite side of the core and the same number of metal interconnect layer away from the core. During this pattern-matching process, the contiguity of electrical connection in the metal layers with a low density wiring may become disrupted. The disruption is healed by an additional design step in which the contiguity of the electrical connection in the low density is reestablished.
Abstract:
A method for increasing the wiring channels/density under dense via fields of a circuit board are provided. With the method, the power/ground lines for the circuit board are designed to be provided in an orthogonal or diagonal pattern. The land grid array (LGA)/ball grid array (BGA) makes contact only on the surface pads of the printed circuit board with no plated through holes/vias underneath these surface pads. This opens up wiring channels, which previously used to be occupied by plated through holes and anti-pads, that can now be used for maximizing signal line wiring routing.