Abstract:
Provided is a method of manufacturing a circuit board. The method includes: preparing a base substrate including a core layer and a first conductive layer that is formed on at least one surface of the core layer and includes an internal circuit pattern; forming a build-up material to cover the first conductive layer; forming in the build-up material at least one cavity through which the core layer and the first conductive layer are exposed; forming a laminated body by curing the build-up material in which the at least one cavity is formed; and forming a second conductive layer including an external circuit pattern on an outer surface of the laminated body.
Abstract:
A wiring board and method of forming a wiring board including a first substrate, a second substrate having a smaller mounting area than a mounting area of the first substrate, and a base substrate laminated between the first substrate and the second substrate, such that the first substrate extends beyond an edge of the second substrate. An IVH (Interstitial Via Hole) or through hole penetrates the base substrate and vias are formed in at least one of the first substrate or the second substrate.
Abstract:
Manufacturing circuits with reference plane voids over vias with a strip segment interconnect permits routing critical signal paths over vias, while increasing via insertion capacitance only slightly. The transmission line reference plane defines voids above (or below) signal-bearing plated-through holes (PTHs) that pass through a rigid substrate core, so that the signals are not degraded by an impedance mismatch that would otherwise be caused by shunt capacitance from the top (or bottom) of the signal-bearing PTHs to the transmission line reference plane. In order to provide increased routing density, signal paths are routed over the voids, but disruption of the signal paths by the voids is prevented by including a conductive strip through the voids that reduces the coupling to the signal-bearing PTHs and maintains the impedance of the signal path conductor.
Abstract:
An integrated circuit substrate is designed and fabricated with a selectively applied transmission line reference plane metal layer to achieve signal path shielding and isolation, while avoiding drops in impedance due to capacitance between large diameter vias and the transmission line reference plane metal layer. The transmission line reference plane defines voids above (or below) the signal-bearing plated-through holes (PTHs) that pass through a rigid substrate core, so that the signals are not degraded by an impedance mismatch that would otherwise be caused by shunt capacitance from the top (or bottom) of the signal-bearing PTHs to the transmission line reference plane. For voltage-plane bearing PTHs, no voids are introduced, so that signal path conductors can be routed above or adjacent to the voltage-plane bearing PTHs, with the transmission line reference plane preventing shunt capacitance between the signal path conductors and the PTHs.
Abstract:
A package substrate free of malfunction or error even with an IC chip in a high frequency range, particularly an IC chip with a frequency exceeding 3 GHz, is provided. A conductor layer 34P on a core substrate 30 is formed to have a thickness of 30 μm and a conductor circuit 58 on an interlayer resin insulating layer 50 is formed to have a thickness of 15 μm. By making the conductor layer 34P thick, it is possible to increase a volume of the conductor itself and decrease resistance. Further, by employing the conductor layer 34 as a power supply layer, it is possible to improve a capability of supplying power to the IC chip.
Abstract:
A method for manufacturing a reliable multilayer wiring substrate at a relatively low cost having little or no warpage or distortion is provided. In certain embodiments an insulation core made of an insulation material that is more rigid than that of resin insulation layers is prepared. A through hole is formed through core upper and lower surfaces of the insulation core, and a through hole conductor is formed therein. A plate-like substrate is prepared, and resin insulation layers and at least one conductor layer are laminated on the substrate to form a first buildup layer. The insulation core is laminated on the first buildup layer so as to electrically connect the conductor layer and the through hole conductor. Resin insulation layers and at least one conductor layer are then laminated on the insulation core. Lastly, the substrate is separated from the first buildup layer to yield a multilayer wiring substrate.
Abstract:
A package substrate free of malfunction or error even with an IC chip in a high frequency range, particularly an IC chip with a frequency exceeding 3 GHz, is provided. A conductor layer 34P on a core substrate 30 is formed to have a thickness of 30 μm and a conductor circuit 58 on an interlayer resin insulating layer 50 is formed to have a thickness of 15 μm. By making the conductor layer 34P thick, it is possible to increase a volume of the conductor itself and decrease resistance. Further, by employing the conductor layer 34 as a power supply layer, it is possible to improve a capability of supplying power to the IC chip.
Abstract:
A board for mounting electronic circuit parts includes a first connection terminal group including a plurality of connection terminals densely formed on the top surface of a substrate having through holes formed therein, and a second connection terminal group including a plurality of connection terminals formed at at least the peripheral portion of a back surface of the substrate. The first connection terminal group is connected to the second connection terminal group by way of the through holes. A build-up multilayer interconnection layer having via holes is formed on the top surface of the substrate, so that the first connection terminal group is connected to the second connection terminal group through the build-up multilayer interconnection layer and the through holes. According to another aspect, each signal line on the top surface of the build-up multilayer interconnection layer comprises a plurality of wiring patterns having different widths and a taper-shaped pattern that connects those wiring patterns together and whose width continuously changes. Each signal line has a smaller width at an area having a relatively high wiring density than at an area having a relatively low wiring density.
Abstract:
A method, system and apparatus for coating plated through holes (PTHs) to reduce impedance discontinuity in electronic packages. PTH vias are imbedded in the core of a printed circuit board comprising a core layer, a plurality of buildup layers, a plurality of micro-vias, and a plurality of traces. Traces electrically interconnect each of the micro-vias to PTH vias, forming an electrically conductive path. PTHs are coated with a magnetic metal material, such as nickel, to increase the internal and external conductance of the PTHs, thereby providing decreased impedance discontinuity of the signals in electronic packages.
Abstract:
A device and/or apparatus having plated through holes (PTHs) which are coated to reduce impedance discontinuity in electronic packages. PTH vias are imbedded in the core of a printed circuit board comprising a core layer, a plurality of buildup layers, a plurality of micro-vias, and a plurality of traces. Traces electrically interconnect each of the micro-vias to PTH vias, forming an electrically conductive path. PTHs are coated with a magnetic metal material, such as nickel, to increase the internal and external conductance of the PTHs, thereby providing decreased impedance discontinuity of the signals in electronic packages.