Abstract:
A printed circuit board has a dielectric constant different from the dielectric constant of free space, with at least two microstrip lines routed adjacent to one another on a surface of the printed circuit board. A dielectric coating is applied to at least one of the at least two microstrip lines such that the dielectric constant of the dielectric coating differs from the dielectric constant of free space. In a further embodiment, the dielectric coating comprises a material having a dielectric constant approximately equal to the dielectric constant of the printed circuit board.
Abstract:
A circuit board structure and a method for fabricating the same are disclosed, including providing a core board having conductive traces and solder pads respectively formed thereon, wherein width of the solder pads corresponds to that of the conductive traces, and pitch between adjacent solder pads is made wide enough to allow multiple conductive traces to pass through; forming on the core board an insulating layer with openings for exposing the solder pads therefrom; forming on the insulating layer a plurality of extending pads electrically connected to the solder pads respectively, wherein the projection area of the extending pads is larger than that of the corresponding solder pads and covers conductive traces adjacent to the corresponding solder pads. Thus, more conductive traces are allowed to pass between adjacent solder pads and meanwhile, the extending pads provide an effective solder ball wetting area for achieving good solder joints and sufficient height after collapse.
Abstract:
While gradually increasing the widths of signal lines (104a, 104b, 105a, 105b) of first and second groups of differential signal lines (104, 105) to suppress attenuation in the lines, the opening widths of slits (104s, 105s) formed in a GND layer (102) below the differential signal lines are similarly changed. Thereby, impedance matching is realized. Further, by alternately disposing a large-width side and a small-width side of the two groups of differential signal lines (104, 105), the total wiring area widths are reduced.
Abstract:
There is provided a wiring board having a shield function. The wiring board includes: a plurality of conductive shield patterns adapted to surround a circumference of at least one electronic component mounting area on the wiring board, the plurality of conductive shield patterns being adjacent to each other; and at least one inductor formed of a conductive pattern and provided between the conductive shield patterns.
Abstract:
A flexible printed circuit board includes: a base film that has electrical insulation property; a conductive pattern that is formed on the base film and including a pair of differential signal lines and a ground line; an insulating layer that is formed on the conductive pattern; a conductive layer that is formed on the insulating layer; and a connecting portion that electrically connects the ground line and the conductive layer through a penetration hole formed on the insulating layer.
Abstract:
As a power feed route in a semiconductor chip, a power feed route which reduces antiresonance impedance in the frequency range of tens of MHz is to be realized thereby to suppress power noise in a semiconductor device. By inserting structures which raise the resistance in the medium frequency band into parts where the resistance is intrinsically high, such as power wiring in a semiconductor package and capacitor interconnecting electrode parts, the antiresonance impedance in the medium frequency band can be effectively reduced while keeping the impedance low at the low frequency.
Abstract:
Embedded passive device structure and its manufacturing method for mainly embedding the passive device structure in the printed circuit board are presented. In this structure, both the source electrode and the ground electrode of the passive device belong to the same level, and includes several source branches and several ground branches that are formed vertically on the inside of the dielectric layer of the circuit board which are connected, respectively, to avoid the conducting between the source electrode and the ground electrode during lamination. When it is in the form of the capacitor structure, through the use of the ultra-fine wiring technique, these source branches and ground branches are separated by a small gap between each other. Therefore, the side face area and quantities of the source branches and ground branches are both increased.
Abstract:
A printed circuit board includes a base insulating layer, first to third signal lines, a first cover insulating layer and a conductive layer. Wide parts are formed in the first to third signal lines. The first cover insulating layer is provided on the base insulating layer so as to cover the wide parts. The conductive layer is provided on the first cover insulating layer so as to cover a portion above the wide parts.
Abstract:
A structure of a packaging substrate and a method for making the same are disclosed, wherein the structure comprises: a substrate body having a circuit layer on the surface thereof, wherein the circuit layer has a plurality of conductive pads which are each formed in a flat long shape to enhance the elasticity of circuit layout; a solder mask disposed on the substrate body and having a plurality of openings corresponding to and exposing the conductive pads, wherein the openings are each formed in a flat long shape; and a metal bump disposed in each of the openings of the solder mask and on each of the corresponding conductive pads.
Abstract:
Methods and apparatus for accessing a high speed signal routed on a conductive trace on an internal layer of a printed circuit board (PCB) using high density interconnect (HDI technology) are provided. The conductive trace may be coupled to a microvia (μVia) having a conductive dome disposed above the outer layer pad of the μVia. In-circuit test (ICT) fixtures or high speed test probes may interface with the conductive dome to test the high speed signal with decreased reflection loss and other parasitic effects when compared to conventional test points utilizing plated through-hole (PTH) technology.