Abstract:
Printed circuit board capacitors include a first electrode comprising a via extending at least partially through a multi-layer printed circuit board and a plurality of conductive pads in electrical contact with the via and extending radially outward from the via, and a second electrode electrically isolated from the first electrode and comprising a plurality of ground-plane layers of the printed circuit board. The plurality of ground-plane layers include electrically conductive material overlapping the plurality of conductive pads.
Abstract:
In some embodiments, the semiconductor package includes a substrate having multiple layers, from a first layer to a final layer, a die coupled to the first layer, an electrical connector such as a solder ball coupled to the final layer, and a spiral trace disposed and electrically coupled between the die and the electrical connector. Inductance of the spiral trace is selected such that the package has a predetermined impedance. Material, cross-sectional area, number and density of windings, and total overall length of the spiral trace are selected accordingly. In other embodiments, the semiconductor package includes a substrate with multiple layers; a die coupled to the first of the layers; an electrical connector coupled to the final layer; and a spiral trace, in or on the substrate. The spiral trace is near the die, and electrically coupled between the die and the electrical connector.
Abstract:
An integrated circuit package having a multi-segment transmission line transformer for impedance matching a packaged integrated circuit, such as a driver or receiver, to a printed circuit board (PCB) transmission line to which the packaged chip is attached by, for example, solder balls. In one exemplary embodiment, a three-segment transmission line transformer provides improved broadband performance with the advantage of having a middle segment with a flexible length for easier routing. The length of each end segment of the three-segment transformer is adjusted to provide at least partial cancellation of reflections between the PCB and the transformer, and between the transformer and a circuit on the integrated circuit, respectively. Further, the inductive reactance of the solder balls and via wiring may be cancelled out by the transformed chip impedance to provide a non-inductive termination to the PCB transmission line at approximately one-half the highest data rate of the channel.
Abstract:
The present invention relates to a printed circuit board arrangement with a multi-layer substrate (1, 2) having a buried conductor (4) and a contact area (3), connected to the conductor (4) and being disposed on a surface of the substrate. In order to improve the cooling of the buried conductor, a metal cooling area (6) is provided above the conductor (4), and is connected to the conductor by means of one or more via conductors (7).
Abstract:
Proposed is an apparatus for silencing electromagnetic noise, characterized by a plurality of centrally symmetrical ring-shaped through-via-hole crystalline units provided between a high voltage plane and a low voltage plane at a regular interval, thereby forming an omnidirectional noise suppression frequency band for reducing noise interference and electromagnetic radiation. In a first embodiment of the ring-shaped through-via-hole crystalline units, the through via holes are perpendicularly coupled between a metal plane and the low voltage plane. In a second embodiment of the ring-shaped through-via-hole crystalline units, the through via holes are perpendicularly coupled between two metal planes. Positioned at a regular interval, the through via holes enable provision of omnidirectional noise suppression frequency band, simplified design of a power plane, and reduction of production costs.
Abstract:
A high frequency module incorporates a layered substrate. The layered substrate has a bottom surface and a top surface. Terminals are disposed on the bottom surface. SAW filters and inductors are mounted on the top surface. The layered substrate incorporates: a first conductor layer connecting the SAW filters to the inductors; a second conductor layer connected to the terminals and disposed at a location closer to the bottom surface than the first conductor layer; and a plurality of parallel signal paths each of which is formed using at least one through hole provided inside the layered substrate and each of which connects the first and second conductor layers to each other.
Abstract:
Impedance mismatching points such as a VIA and a connector on a differential line between a differential driver element and a differential receiver element are arranged in predetermined positions. That is, the impedance mismatching points are arranged in such positions that a transmission time of a digital signal transmitted through a main differential line becomes (integral multiple of UI)±0.5×Trf, whereby noises are generated within the rise and fall times of a signal to be able to maintain an excellent waveform of the signal.
Abstract:
A multilayer substrate has a 1st strip line, a 2nd strip line and the 3rd strip line, and those characteristic impedances are different each other. The third strip line has a strip conductor of which length is equivalent to ¼ wavelength of an operating frequency. A strip conductor of the third strip line is the same conductor as a strip conductor of the first strip line, and is a different conductor layer from a strip conductor of the second strip line. Ground conductors of the 3rd strip line are formed of the same conductor layer as one of a ground conductor of the 1st strip line, and the same conductor layer as one of a ground conductor of the 2nd strip line. The strip conductor of the second strip line and the strip conductor of the third strip line are connected through via hole arranged in the multilayer substrate.
Abstract:
There is disclosed an electronic testbed, an electronic testbed board, and a method for positioning receptacles for nails in the electronic testbed board. In an embodiment, the electronic testbed board includes a mounting through-hole for mounting a receptacle for a nail. The mounting through-hole is drilled to a suitably precise diameter for mounting the receptacle substantially perpendicular to the testbed board. One or more via-holes are located adjacent the mounting through-hole, and are adapted to allow an electrical connection between any conductive layers provided at the one or more via-holes. The receptacle may be mounted more accurately and the electronic test bed may be built more accurately by separating the functions of the via-holes and the mounting through-hole.
Abstract:
This invention provides a printed wiring board having an intensified drop impact resistance of a joint portion between pad and solder. An electrode pad comprises pad portion loaded with solder ball and a cylindrical portion projecting to the solder ball supporting the pad portion. An outer edge of the pad portion extends sideway from a cylindrical portion so that the outer edge is capable of bending. If the outer edge bends when stress is applied to the solder ball 30, stress on the outer edge of the pad portion on which stress is concentrated can be relaxed so as to intensify the joint strength between an electrode pad and solder ball.