摘要:
A common mode filter includes a ground element, a transmission line pair and an extension element, which are disposed in first to third signal layers of a circuit board. The ground element includes a ground portion and a first ground line electrically connected with each other. The first ground line is disposed in a slot of the ground portion, and extends from a bottom portion to an opening of the slot. An orthogonal projection of the transmission line pair on the first signal layer is partially overlapped with an orthogonal projection of the ground portion on the first signal layer. The orthogonal projection of the transmission line pair on the first signal layer is not overlapped with an orthogonal projection of the first ground line on the first signal layer. The extension element is electrically connected to the first ground line through at least one conductive via.
摘要:
An electromagnetic interference suppressing structure including a multi-layered substrate; a differential pair including first and second signal lines which are disposed on a first layer of the multi-layered substrate; and two grounding recess structures disposed symmetrically in a second layer of the multi-layered substrate which is positioned under the first layer, and on both sides, respectively, of the differential pair, wherein no electrical coupling element extends across a region lying directly under the differential pair, between the two grounding recess structures.
摘要:
An interconnect topology is disclosed that includes a plurality of interconnections, each of which is coupled together using a via, where at least two of the vias are staggered with respect to each other. In one embodiment, the interconnect topology comprises a substrate, multiple signal traces routed through the substrate on multiple layers, and a plurality of vias, where each via couples a pair of the signal traces to form an interconnection between different ones of the multiple layers, and where a pair of vias comprise a first via to carry a positive differential signal via and a second via to carry a negative differential signal that are coupled to signal traces to form a differential signal pair. The differential first and second vias are staggered with respect to each other.
摘要:
An apparatus for reducing interference between clock signals may include a circuit board and a first set of clock vias coupled to the circuit board. The apparatus may also include a second set of clock vias coupled to the circuit board in a linear pattern adjacent to the first set of clock vias. The first set of clock vias may transmit a first clock signal and the second set of clock vias may transmit a second clock signal with a frequency that is different from the first clock signal. The system may further include a ground via coupled to the circuit board in line with the second set of clock vias. Each ground via coupled to the circuit board may be positioned outside any region of the circuit board located between the first and second sets of clock vias. Various other apparatuses, systems, and methods are also disclosed.
摘要:
A semiconductor device is provided with improved resistance to noise. Conductive planes are respectively formed over wiring layers. One wiring layer is provided with a through hole land integrally formed with a through hole wiring. In other wiring layers located over the wiring layer with the through hole land, openings are respectively formed in the conductive planes. The area of each of the openings is larger than the plane area of the through hole land.
摘要:
A printed circuit board (PCB) assembly includes a PCB having a core substrate, a plurality of conductive traces on a first surface of the PCB, and a ground layer on the second surface of the PCB. The conductive traces comprise a pair of differential signal traces. An intervening reference trace is disposed between the differential signal traces. A connector is disposed at one end of the plurality of conductive traces. A semiconductor package is mounted on the first surface at the other end of the plurality of conductive traces.
摘要:
A multi-layer printed circuit board comprises: at least two insulation layers, respectively having glass fiber cloth and cured resin covering thereon, the insulation layers being stacked on each other; an internal trace layer formed between two neighboring insulation layers; and an external trace layer formed on an outer surface of the outermost insulation layer; wherein the insulation layers have a dielectric constant of 3.4 or less, and the internal and external trace layers have a trace width between 40 and 75 micrometers, such that the multi-layer printed circuit board has a characteristic impedance between 45 and 55 Ω in single-ended signaling and between 90 and 110 Ω in differential signaling.
摘要:
The present invention is related to an electromagnetic noise filter device and an equivalent filter circuit thereof. The filter device comprises a substrate, a transmission line and a ground plane having slotted ground structure. The transmission line is configured on the top surface of the substrate, and the grounding plane is configured on the bottom surface of the substrate. At least one pair of impedance elements are configured within the slotted ground structure. The transmission line can be electromagnetic coupled to the slotted ground structure and the impedance elements so as to form an equivalent filter circuit. Thereby, the electromagnetic noises on at least one specific frequency may be absorbed by the impedance elements of the filter device so as to avoid the electromagnetic reflection induced by the electromagnetic noise and interfering the signal transmitted on the transmission line.
摘要:
A through-hole layout structure is suitable for a circuit board. The through-hole layout structure includes a pair of first differential through-holes, a pair of second differential through-holes, a first ground through-hole, a second ground through-hole, and a third ground through-hole, which are all arranged on a first line.The first ground through-hole is located between the pair of first differential through-holes and the pair of second differential through-holes. The pair of first differential through-holes is located between the first ground through-hole and the second ground through-hole. The pair of second differential through-holes is located between the first ground through-hole and the third ground through-hole.
摘要:
An electrical interconnect has a non-planar ceramic substrate with opposing first and second ends. A first conductive layer having first and second opposing sides is disposed within the ceramic substrate with one of the first and second opposing sides exposed at the first end and one of the first and second opposing sides exposed at the second end. The electrical interconnect is useful to join an integrated circuit in a hybrid package to a circuit board in high frequency communication applications.