摘要:
The escape of signals from a semiconductor chip to a printed wiring board in a flip chip/ball grid array assembly is improved by repositioning the signals from the chip through the upper signal layers of the carrier. This involves fanning out the circuit lines through the chip carrier from the top surface that communicates with the chip through the core to the bottom surface where signals exit the carrier to the printed wiring board, which is achieved by making better utilization of the surface area of the signal planes between the core and the chip. The signals are fanned out on each of the top signal planes so that many more of the signals are transmitted through the vias in the core to the bottom signal planes where they can escape outside of the footprint area of the chip, thereby increasing the density of circuits escaping the footprint area.
摘要:
The escape of signals from a semiconductor chip to a printed wiring board in a flip chip/ball grid array assembly is improved by repositioning the signals from the chip through the upper signal layers of the carrier. This involves fanning out the circuit lines through the chip carrier from the top surface that communicates with the chip, through the core to the bottom surface where signals exit the carrier to the printed wiring board. This fanning out is achieved by making better utilization of the surface area of the signal planes between the core and the chip. The signals are fanned out on each of the top signal planes so that many more of the signals are transmitted through the vias in the core to the bottom signal planes where they can escape outside of the footprint area of the chip thereby increasing the density of circuits escaping the footprint area.
摘要:
The escape of signals from a semiconductor chip to a printed wiring board in a flip chip/ball grid array assembly is improved by repositioning the signals from the chip through the upper signal layers of the carrier. This involves fanning out the circuit lines through the chip carrier from the top surface that communicates with the chip, through the core to the bottom surface where signals exit the carrier to the printed wiring board. This fanning out is achieved by making better utilization of the surface area of the signal planes between the core and the chip. The signals are fanned out on each of the top signal planes so that many more of the signals are transmitted through the vias in the core to the bottom signal planes where they can escape outside of the footprint area of the chip thereby increasing the density of circuits escaping the footprint area.
摘要:
The density of plated thru holes in a glass fiber based chip carrier is increased by off-setting holes to positions in which fibers from adjacent holes will not connect. Elongated strip zones or regions having a width approximately the diameter of the holes and running along orthogonal columns and rows of holes, parallel to the direction of fibers, define regions of fibers that can possibly cause shorting between holes. Rotating a conventional X-Y grid pattern of equidistant holes so as to position, for example, alternate holes in one direction between the elongated strip zones running in the opposite direction significantly increases the distance between holes along the elongated strip zones running in each direction. The holes are positioned between elongated strip zones with sufficient clearance to compensate for variations in the linear path of fibers.
摘要:
A method provides for additive plating on a subcomposite having filled plated through holes. Fine-line circuitry is achieved via electroless deposition onto a dielectric substrate after the through hole is plated and filled. Fine-line circuitry may be routed over landless, plated through holes thereby increasing the aspect ratio and the available surface area for additional components and wiring.
摘要:
A method of making a circuitized substrate designed to substantially eliminate impedance disruptions during passage of signals through signal lines of the substrate's circuitry. The produced substrate includes a first conductive layer with a plurality of conductors on which an electrical component may be positioned and electrically coupled. The pads are coupled to signal lines (e.g., using thru-holes) further within the substrate and these signal lines are further coupled to a second plurality of conductive pads located even further within the substrate. The signal lines are positioned so as to lie between the substrate's first conductive layer and a voltage plane within a third conductive layer below the second conductive layer including the signal lines. A second voltage plane may be used adjacent the first voltage plane of the third conductive layer. Thru-holes may also be used to couple the signal lines coupled to the first conductors to a second plurality of conductors which form part of the third conductive layer. An electrical assembly and information handling system (e.g., computer) utilizing the substrate are also disclosed.
摘要:
A multilayer chip carrier with increased space for power distribution PTHs and reduced power-related noise. In a multilayer chip carrier with two signal redistribution fanout layers, in addition to signal escape from near-edge signal pads at the first fanout layer, remaining signal pads are moved closer to the edge of the chip footprint. At the voltage layer below the first fanout layer, the remaining signal pads are moved again, closer to the edge of the chip footprint. In the second fanout layer, below the voltage layer, the remaining signal pads escape. The region where signal pads are moved provides increased space for power PTHs.
摘要:
A method of making a circuitized substrate including a composite layer including a first dielectric sub-layer including a plurality of fibers having a low coefficient of thermal expansion and a second dielectric sub-layer of a low moisture absorptivity resin, the second dielectric sub-layer not including continuous or semi-continuous fibers or the like as part thereof. The substrate further includes at least one electrically conductive layer as part thereof.
摘要:
The escape of signals from a semiconductor chip to a printed wiring board in a flip chip/ball grid array assembly is improved by repositioning the signals from the chip through the upper signal layers of the carrier. This involves fanning out the circuit lines through the chip carrier from the top surface that communicates with the chip through the core to the bottom surface where signals exit the carrier to the printed wiring board, which is achieved by making better utilization of the surface area of the signal planes between the core and the chip. The signals are fanned out on each of the top signal planes so that many more of the signals are transmitted through the vias in the core to the bottom signal planes where they can escape outside of the footprint area of the chip, thereby increasing the density of circuits escaping the footprint area.
摘要:
A method of making a circuitized substrate including a composite layer including a first dielectric sub-layer including a plurality of fibers having a low coefficient of thermal expansion and a second dielectric sub-layer of a low moisture absorptivity resin, the second dielectric sub-layer not including continuous or semi-continuous fibers or the like as part thereof. The substrate further includes at least one electrically conductive layer as part thereof.