Abstract:
A hybrid assembly having improved cross talk characteristics includes a substrate having an upper surface. Conductive paths on the upper surface are provided for conducting high frequency signals. Regular polygons made of an electromagnetic band gap (EBG) material having slow wave characteristics are deposited on the upper surface and form a lattice for tessellating the upper surface. Each of the polygons has a periphery. The polygons are separated along their periphery from adjacent polygons by an interspace and are covered with an insulating material. Second polygons, also made of an electromagnetic band gap material, are deposited over the insulating material. Semiconductor structures are mounted over the second polygons. The semiconductor structures have a plurality of electrical contacts with the conductive paths. The regular polygons can be hexagons, triangles, octagons or any other combination that forms a lattice and can be printed onto the substrate.
Abstract:
An inductor device having plural spiral-shaped interconnection structures connected to each other and extending in plural power source layers, the power source layers being in different levels of a multilayer printed board. The printed board having first and second current loops. The loops share part of a common current path.
Abstract:
A multi-layered substrate has a voltage reference signal circuit layout therein. A major change in the design of the multi-layered substrate is the moving of a reference signal trace from a signal layer to a non-signaling layer. Once the reference signal trace is moved, the signal traces within the signal layer can have a larger layout area. Similarly, the reference signal trace within the non-signaling layer can have greater layout flexibility in addition to electromagnetic shielding from other signal traces. Moreover, the reference signal trace having a greater width may be used to reduce parasitic resistance within the reference signal circuit.
Abstract:
A hybrid assembly having improved cross talk characteristics includes an electromagnetic band gap (EBG) layer on a substrate having an upper surface and a lower surface and a semiconductor structure (MMIC) mounted above the EBG layer. A plurality of stars made of an EBG material are preferably printed, or deposited, on the upper surface. The EBG material has slow wave characteristics. The plurality of stars tessellates the upper surface between conductive paths. Each of the stars has a center section formed from a regular polygon, the center section having projections extending from the center section. The projections and the center section form a periphery. The periphery engages adjacent stars along the periphery. Stars are separated from adjacent stars by an interspace. Each of the stars is connected to a conductive via, in turn connected to ground potential. A conductive layer at ground potential is electrically continuous with vias used to interconnect all stars forming the EBG layer.
Abstract:
An arrangement of differential pairs in a multi-layer printed circuit board is provided for eliminating crosstalk. The arrangement of differential pairs in the multi-layer printed circuit board includes a first differential pair, and a second differential pair. The first differential pair and the second differential pair may each be a driven pair or a victim pair. By properly arranging the first differential pair and the second differential pair, in accordance with the present invention, the resultant crosstalk on the first differential pair induced by the second differential pair, or vice versa, is substantially zero or negligible.
Abstract:
A multi-layered printed wiring board is provided that is capable of securing required wiring density even with a decreased number of wiring layers and reducing radiation noises. The multi-layered printed wiring board has at least three wiring layers each at least having at least one power supply line or a ground line, and another kind of line, said wiring layers each having an outer edge. A ground line is formed at the outer edge of at least one of the wiring layers. A basic power supply line is formed inside the ground line. At least one power supply line extends from the basic power supply line. A plurality of electronic parts are mounted on at least one of the wiring layers. The at least one power supply line is wired to mounting positions of the electronic parts via at least one of the wiring layers.
Abstract:
In a printed circuit board of the invention, a first signal wiring layer, a first ground layer, a second ground layer and a second signal wiring layer are laminated via an insulating material. A first signal wiring is formed on the first signal wiring layer and a second signal wiring is formed on the second signal wiring layer. The two signal wirings are connected via a first through hole. The conductive first ground layer and the conductive second ground layer are connected via a second through hole. The second through hole is insulated from the first through hole and formed so as to surround the first through hole.
Abstract:
A layer allocating apparatus for a multi-layer circuit board is disclosed. In a preferred embodiment, the layer allocating apparatus arranged from top to bottom as a component layer, a ground layer, a power layer, and a solder layer. The powerlayer is sliced into a plurality of reference ground areas each is located at somewhere to correspond to signal layout areas of the solder layer, so as to allow signal lines of the component layer and solder layer to take reference to the reference ground areas on the adjacent power layer. The power layer also includes a plurality of power layers each provides different operating voltages, and electrically couples with corresponding power layouts of the solder layer and component layer through vias, thereby enlarging the total area of power planes, so as to provide a table power source and attenuate the ground/bounce effect.
Abstract:
A multilayer wiring substrate includes differential signal wires placed within a first insulating layer between a first power-supply plane and a first ground plane; and general signal wires placed within a second insulating layer between a second power-supply plane and a second ground plane. In the multilayer wiring substrate, the differential signal wires are placed in a different plane from a plane having each of the general signal wires so that the different plane includes a first area having the differential signal wires, and a second area having one of the second power-supply plane and the second ground plane. The general signal wires are placed in a vertical direction of the second area in a laminated state so that each of the general signal wires is placed between the second power-supply plane and the second ground plane.
Abstract:
In a coupling adjusting structure for a double-tuned circuit according to the present invention, first and second coils are configured such that a pair of first conductive patterns formed on a first surface of a printed circuit and a corresponding pair of second conductive patterns formed on a second surface of the printed circuit board are connected via corresponding connecting conductors, thereby making the first and second coils low and thin. Also, one end of the first coil and the corresponding end of the second coil are disposed close to each other, a first ground conductive pattern is disposed at least on the first surface of the printed circuit, and a first jumper connected to the first ground conductive pattern is disposed between the first and second coils so as to adjust an inductive coupling of the double-tuned circuit, thereby achieving a coupling adjusting structure for a double-tuned circuit whose inductive coupling is adjustable.