Abstract:
A circuitized substrate which includes a plurality of contiguous open segments which define facing edge portions within an electrically conductive layer to isolate separate portions of the conductive layer such that the layer can be used for different functions, e.g., as both power and ground elements, within a product (e.g., electrical assembly) which includes the substrate as part thereof. A method of making the substrate, an electrical assembly utilizing the substrate, a multilayered circuitized assembly also utilizing the substrate and an information handling system, e.g., a mainframe computer, are also provided.
Abstract:
A multilayer circuit board including a laminate of at least one insulating layer and at least one wiring layer. The wiring layer is formed by a composite member having a first metal layer and a second metal layer formed on one or both sides of the first metal layer. The first metal layer having a smaller coefficient of thermal expansion than the second metal layer. The second metal layer having a higher electric conductivity than the first metal layer. The insulating layer has a blind via-hole with a bottom provided by a surface of the second metal layer. A layer-to-layer interconnection portion is provided on the surface of the insulating layer and in the blind via-hole and is formed in the blind via-hole to be in contact with the surface of the second metal layer.
Abstract:
The invention relates to an apparatus and method for improving AC coupling between adjacent signal traces and between plane splits and signals spanning plane splits on circuit boards. A circuit board includes adjacent conductive means and an oxide means interposed there between. The oxide means is a copper oxide, e.g., cupric or cuprous oxide. In one embodiment, the adjacent conductive means are adjacent voltage reference planes with a split interposed between the conductive means. The copper oxide fills the split. In another embodiment, the adjacent conductive means are differential signal traces. The copper oxide fills a gap between the differential signal traces. The copper oxide is a non-conductive material with an increased dielectric constant as compared to other common dielectric materials used as fillers. The increased dielectric constant increases capacitance, in turn, increasing AC coupling.
Abstract:
An RF circuit module, in which a power amplifier and a transceiver are united, with reduced interference between its electronic circuit blocks, downsized and still having high performance, and with a stable performance not dependent on the ground land structure on the motherboard, is provided. The ground plane 110 for at least a last-stage amplifier 11 of the power amplifier 10 where the greatest power is generated in the whole RF circuit block, that is, the source of generating the greatest noise and heat for the RF circuit block, is isolated from the ground plane for at least one circuit portion of the transceiver 9 including an LNA 51, receiver 52, transmitter 30, and VCO 70. These ground planes are connected to a common ground plane 480 through different connection conductors, respectively.
Abstract:
A resonator minimizes degradation of the Q factor, accurately adjusts the frequency, and reduces the size and profile thereof. A voltage controlled oscillator including such a resonator includes a multilayer substrate. The multilayer substrate includes a first grounding conductor layer, a first dielectric layer, a strip line layer, a second dielectric layer, a second grounding conductor layer, and a third dielectric layer. A strip line is disposed on the strip line layer, and a microstrip line is disposed on the third dielectric layer. The strip line is connected to the microstrip line via a through hole to define the resonator. A portion of the second grounding conductor layer that faces the microstrip line is removed.
Abstract:
A printed circuit board to electrically couple electrical components has non-conductive layers. Conductive planes are formed on the non-conductive layers. Conductive traces are formed on the non-conductive layer to provide signal paths for the electrical components. Delay devices coupled to the conductive traces to space apart signals so as to minimize electric field effects on nearby signals.
Abstract:
An apparatus for routing electrical signals is a layered structure having at least one signal trace disposed on a first side of an electrically insulating layer with a via electrically connected to the trace. The via also has a conductive stub trace electrically connected thereto. A generally planar electrically conductive reference layer is on a second side of the electrically insulating layer and the stub trace on the first side defines an area on the second side where the electrically conductive layer is absent. Removing a portion of the conductive reference layer increases the impedance of the stub trace without changing the impedance of the signal trace thereby improving an impedance match to another electrical element to which the apparatus is connected. A method for manufacturing a layered structure for routing electrical signals comprising the steps of providing a layout for the layered structure having an insulating layer with at least one signal trace, a via, and a stub trace on a first side of the insulating layer, and a generally planar electrically conductive layer disposed on a second side of the insulating layer. Identify the stub trace and define a beneficial portion on the second side based upon a layout of the stub trace where the electrically conductive layer on the second side is to be absent. Modify the layout according to the step of defining and manufacture the layered structure according to the modified layout.
Abstract:
A technique has been developed whereby crosstalk induced in a first electrical connection by current flow at an adjacent second electrical connection is at least partially cancelled by an opposing crosstalk signal induced at an inductive coupling between electrical traces extending from or toward the first and second electrical connections, respectively. Crosstalk cancellation is provided by orienting the electrical traces such that current flow through the second electrical connection and respective electrical trace induces an opposing crosstalk signal at the inductive coupling. In some configurations, an inductive coupling between electrical traces includes essentially parallel portions of the traces and an aperture in a voltage plane. In some configurations, cancellation of crosstalk induced by multiple adjacent electrical connection is provided. Crosstalk inducing electrical connections include pins, solder bumps, leads, wires, edge connectors, etc. In various configurations, crosstalk cancellation is provided on a board, on a semiconductor package, or on a semiconductor integrated circuit. The crosstalk inducing electrical connections may be integral with the board, package or integrated circuit or may be mated therewith.
Abstract:
A signal transmission structure includes at least one reference plane with a non-reference area, and a signal line with a salient protruding over the edge of the signal line and the salient is corresponding to the position of the non-reference area. When a signal passes through the signal line, the effect of the parasitic capacitance between the salient and the reference plane can improve the characteristic impedance mismatch. Therefore, the signal transmission structure can reduce the insertion loss and increase the reduction of the return loss in order to locally compensate the impedance mismatch.
Abstract:
A semiconductor device package includes multiple built-up layers of metal sandwiching non-conductive layers. The metal layers have grids of degassing holes arranged in rows and columns. The rows and columns are locatable via a first coordinate system. Signal traces are embedded within the non-conductive layers such that the signal traces are also sandwiched between the metal layers with degassing holes. The signal traces generally run at zero degrees, 45 degrees, and 90 degrees relative to a second coordinate system. The first coordinate system is rotated relative to the second coordinate system to lower impedance variations of different traces. Impedance variations decrease due to the decreased variation in the number of degassing holes passed over or under by a trace. The grid of degassing holes on one metal layer can be offset in two dimensions relative to the degassing holes on another layer.