Abstract:
First and second signal wiring patterns are formed in a first conductor layer. A first electrode pad electrically connected to the first signal wiring pattern through a first via and a second electrode pad electrically connected to the second signal wiring pattern through a second via are formed in a second conductor layer as a surface layer. A third conductor layer is disposed between the first conductor layer and the second conductor layer with an insulator interposed between those conductor layers. A first pad electrically connected to the first via is formed in the third conductor layer. The first pad includes an opposed portion which overlaps the second electrode pad as viewed in a direction perpendicular to the surface of a printed board and which is opposed to the second electrode pad through intermediation of the insulator. This enables reduction of crosstalk noise caused between the signal wirings.
Abstract:
A circuit board includes a first and second ground layer and a plurality of signal vias extending between the ground layers but not electrical contact therewith. Ground vias coupled to the first and second ground layers can be positioned adjacent signal vias and can include ground traces that extend between adjacent ground vias. Air holes can be positioned between signal vias and/or adjacent signal vias to modify the electrical performance of the circuit board. Ground wings can be used to help tune common-mode and/or differential-mode impedances.
Abstract:
A printed circuit includes a substrate having a pair of opposite sides. A signal via extends through at least one of the sides and at least partially through the substrate between the sides. Aggressor vias extend through at least one of the sides and at least partially through the substrate between the sides. The aggressor vias are arranged in a pattern around the signal via. Linear paths are defined between the signal via and the aggressor vias. At least some of the aggressor vias are arranged along the substrate directly adjacent the signal contact. Ground vias extend through at least one of the sides and at least partially through the substrate between the sides. The ground vias are arranged around the signal via. At least one ground via is positioned along each linear path between the signal via and each of the aggressor vias that is directly adjacent the signal via.
Abstract:
A printed circuit board includes a first signal via, a second signal via, and a first ground via. A distance between the first ground via and the first signal via is substantially equal to a distance between the first ground via and the second signal via.
Abstract:
Disclosed herein is an electromagnetic wave shielding substrate including an electromagnetic bandgap structure which is formed along the edge thereof in order to prevent electromagnetic waves from being emitted therefrom. The electromagnetic wave shielding substrate can effectively prevent the emission of electromagnetic waves.
Abstract:
The present invention relates to a wiring structure for reducing the equivalent series inductance (ESL) of a laminated capacitor. The laminated capacitor comprises a number of conductive layers, a power via extending along a thickness direction of the laminated capacitor and arranged to extend from the top conductive layer to the bottom conductive layer, and a ground via extending along the thickness direction of the laminated capacitor and arranged to extend from the top conductive layer to the bottom conductive layer. The conductive layers include a set of first conductive layers and a set of second conductive layers. The power via is electrically coupled to the first conductive layers and the ground via is electrically coupled to the second conductive layers. The laminated capacitor further comprises a supplemental via between the power via and the ground via. The supplemental via is shorter in length than the power via and the ground via. The supplemental via is electrically coupled to one of the first conductive layers and the second conductive layer.
Abstract:
A wiring board has a plurality of wiring layers, a first land, a second land, a first via and a second via. The first land and the second land are formed on at least one wiring layer of the wiring board and are disposed to partially overlap with each other. The first via and the second via are formed in association with the first land and the second land, respectively. The first via and the second via electrically connect a first wiring layer and a second wiring layer of the plurality of wiring layers to each other. The wiring board has a separator that is formed by a hole that separates the first land and the second land from each other.
Abstract:
An arrangement of non-signal through vias suitable for a wiring board is provided. The wiring board has a contact surface, a core layer and pads. The contact pads are disposed on the contact surface, while the arrangement of non-signal through vias includes first non-signal through vias and a second non-signal through via. The first non-signal through vias pass through the core layer and are electrically connected to some of the contact pads. The second non-signal through via which passes through the core layer is disposed between the first non-signal through vias and is not electrically connected to the contact pads. The interval between the second non-signal through via and anyone of the surrounding first non-signal through vias is smaller than or equal to 0.72 times of the minimum interval between any two of the contact pads electrically connected to the corresponding first non-signal through vias.
Abstract:
A layout configuration of a differential pair for a printed circuit board (PCB) having a signal plane is provided. In a preferred embodiment, the layout configuration comprises: a differential pair on the signal plane; a pair of vias abutting the differential pair, and the pair of vias being mutually dissymmetrical about the differential pair; and a distance between the pair of vias along the differential pair being equal to ½ TV, wherein T is a signal rise time, V is a speed of the signal. Therefore, the layout configuration can meet with the requirements of impedance matching, reduce reflection, and improve signal integrity.
Abstract:
Provided are vertical transitions which have the high electrical performance and the high shielding properties in the wide frequency band in a multilayer PCB, printed circuit boards with the vertical transitions and semiconductor packages with the printed circuit boards and semiconductor chips. In vertical transitions for a multilayer PCB, a wave guiding channel is a conductor which includes at least more than one of signal vias 201, an assembly of ground vias 202 surrounding the signal via, ground plates from conductor layers of the PCB connected to the ground vias, closed ground striplines 205 connecting the ground vias and power supply layer.