Abstract:
A multilayer circuit board assembly includes one or more radio frequency (RF) interconnects between different circuit layers on different circuit boards which make up the circuit board assembly. The RF interconnects can include one or more RF matching pads which provide a mechanism for matching impedance characteristics of RF stubs to provide the RF interconnects having desired insertion loss and impedance characteristics over a desired RF operating frequency band. The RF matching pads allow the manufacture of circuit boards having RF interconnects without the need to perform any back drill and back fill operation to remove stub portions of the RF interconnects in the multilayer circuit board assembly.
Abstract:
A circuit board comprises signaling through-holes that pass through a plurality of layers, including signal trace and digital ground plane layers, and power reference plane layers. Clearances are set to achieve a desired impedance characteristic for the through-holes. At a power reference plane layer, the clearance is defined around multiple neighboring through-holes.
Abstract:
Disclosed herein is a printed circuit board having an RF module power stage circuit embedded therein. Specifically, this invention relates to a printed circuit board having an RF module power stage circuit embedded therein, in which a terminal pad for a resistor, a bead, or an inductor is defined or formed on a power supply plane of a multilayered wired board to connect the resistor, the bead, or the inductor to the power supply plane, and the resistor, the bead, or the inductor is connected in parallel with a decoupling capacitor by using a via hole or by embedding the resistor, the bead or the inductor perpendicular to the power supply plane, thus decreasing the size of the RF module and improving the performance thereof.
Abstract:
Disclosed herein is a printed circuit board having an RF module power stage circuit embedded therein. Specifically, this invention relates to a printed circuit board having an RF module power stage circuit embedded therein, in which a terminal pad for a resistor, a bead, or an inductor is defined or formed on a power supply plane of a multilayered wired board to connect the resistor, the bead, or the inductor to the power supply plane, and the resistor, the bead, or the inductor is connected in parallel with a decoupling capacitor by using a via hole or by embedding the resistor, the bead or the inductor perpendicular to the power supply plane, thus decreasing the size of the RF module and improving the performance thereof.
Abstract:
A laminated ceramic electronic component includes a plurality of ceramic green sheets. In each of the ceramic green sheets, which are not backed with a carrier film, coil conductor patterns and lead-out electrodes are formed by a screen printing method and simultaneously a conductive paste is filled in holes for via holes to form via holes. The coil conductor patterns include first lands provided at one end of the coil conductor patterns so as to cover the via holes for connection between layers and second lands to be connected to the via holes provided at the other end of the conductive patterns. The second lands are larger in diameter than the first lands, such that the area of the second lands is about 1.10 to about 2.25 times as wide as the area of the first lands.
Abstract:
A circuit board comprises signaling through-holes that pass through a plurality of layers, including signal trace and digital ground plane layers, and power reference plane layers. Clearances are set to achieve a desired impedance characteristic for the through-holes. At a power reference plane layer, the clearance is defined around multiple neighboring through-holes.
Abstract:
A multi-layer printed wiring board has a core substrate, a throughhole structure, a first interlayer insulation layer, a first via, a second interlayer insulation layer and a second via. The core substrate has a throughhole opening, and the throughhole structure is formed in the throughhole opening. The first interlayer insulation layer is formed over the core substrate. The first via is formed in the first interlayer insulation layer and has a bottom portion having a first radius. The second interlayer insulation layer is formed over the first interlayer insulation layer and the first via. The second via is formed in the second interlayer insulation layer and has a bottom portion having a second radius greater than the first radius. The first via is positioned inside a circle having a radius (D1) from a gravity center of the throughhole opening, and the radius (D1) of the circle satisfies a formula, (D1)=(R)+(r)/3, where (R) represents a radius of the throughhole opening and (r) represents the first radius of the first via.
Abstract:
A process for laser forming a blind via in at least one layer of a circuit substrate having a plurality of capture pads of varying geometry can include, for at least one blind via to be formed in at least one layer of a circuit substrate, evaluating a capture pad geometry value (such as area and/or volume) within a predetermined distance from a drilling location with respect to a blind via geometry value (such as area and/or volume) to be formed at the drilling location. The process can include setting at least one laser operating parameter based on the evaluation in order to obtain a desired capture pad appearance after blind via formation. The process can include imaging a capture pad area defined as an area within a predetermined distance from a blind via drilling location in at least one layer of a circuit substrate, quantifying at least one appearance value for the imaged capture pad area, and determining an acceptability of the imaged capture pad areas based on the quantified appearance value.
Abstract:
Systems and methods are taught for blocking the propagation of electromagnetic waves in parallel-plate waveguide (PPW) structures. Periodic arrays of resonant vias are used to create broadband high frequency stop bands in the PPW, while permitting DC and low frequency waves to propagate. Particular embodiments include clusters of small vias that effectively function as one large via, thereby increasing stop band bandwidth and maximizing parallel plate capacitance. Cluster vias can be configured to additionally provide a shielded and impedance matched route within the interior area of the cluster through which signal vias can connect transmission lines disposed in planes lying above and below the PPW. Important applications include electromagnetic noise reduction in layered electronic devices such as circuit boards, ceramic modules, and semiconductor chips.
Abstract:
The disclosed board fabrication techniques and design features enable the construction of a reliable, high-layer-count, and economical backplane for routers and the like that require a large number of signaling paths across the backplane at speeds of 2.5 Gbps or greater, as well as distribution of significant amounts of power to router components. The disclosed techniques and features allow relatively thick (e.g., three- or four-ounce copper) power distribution planes to be combined with large numbers of high-speed signaling layers in a common backplane. Using traditional techniques, such a construction would not be possible because of the number of layers required and the thickness of the power distribution layers. The disclosed embodiments use novel layer arrangements, material selection, processing techniques, and panel features to produce the desired high-speed layers and low-noise high-power distribution layers in a single mechanically stable board.