Abstract:
A motherboard layout method includes positioning two electronic elements on a top layer of a motherboard, and positioning another two electronic elements on a bottom layer of the motherboard, connecting one end of a first electronic element on the top layer to the same end of a first electronic element on the bottom layer with a first via hole, and connecting the same end of a second electronic element on the top layer to the same end of a second electronic element on the bottom layer with a second via hole. The method further includes connecting the other ends of the two electronic elements on the top layer to a first part, and connecting the other ends of the two electronic elements on the bottom layer to a second part.
Abstract:
A registered memory module includes several memory devices coupled to a register through a plurality of transmission lines forming a symmetrical tree topology. The tree includes several branches each of which includes two transmission lines coupled only at its ends to either another transmission line or one of the memory devices. The branches are arranged in several layers of hierarchy, with the transmission lines in branches having the same hierarchy having the same length. Each transmission line preferably has a characteristic impedance that is half the characteristic impedance of any pair of downstream transmission lines to which it is coupled to provide impedance matching. A dedicated transmission line is used to couple an additional memory device, which may or may not be an error checking memory device, to the register.
Abstract:
A printed wiring board including a core substrate, a build-up layer formed over the core substrate and including a first insulating layer, a conductor layer formed over the first insulating layer, and a second insulating layer formed over the conductor layer, and one or more wiring patterns formed over the first insulating layer. The conductor layer includes conductor portions, and the conductor portions have notched portions, respectively, facing each other across the wiring pattern.
Abstract:
A tape wiring substrate may have dispersion wiring patterns. The dispersion wiring patterns may be provided between input/output wiring pattern groups to compensate for the intervals therebetween. Connecting wiring patterns may be configured to connect the dispersion wiring patterns to a first end of the adjacent input/output wiring pattern.
Abstract:
The layout circuit comprises a first 3×2 grid array and a second 3×2 grid array. The first 3×2 grid array comprises first, second and third signal contact points and the first and second fixed potential contact points are coupled to a first fixed potential. The first and second fixed potential contact points are arranged diagonally into the first 2×2 array and the first and second signal contact points are also arranged diagonally into the first 2×2 array. The second 3×2 grid array comprises fourth, fifth and sixth signal contact points and the third and fourth fixed potential contact points are coupled to the first fixed potential. The third and fourth fixed potential contact points are arranged diagonally into the second 2×2 array and the fourth and fifth signal contact points are also arranged diagonally into the second 2×2 array.
Abstract:
Disclosed is a connection arrangement for connecting end portions of differential pairs to pads. In the arrangement, first and second signal traces comprising the differential pair are formed in first and second layers, respectively, of a printed circuit board. Each of the signal traces has a run portion and an end portion. The end portions of the first and second signal traces are connected, respectively, to first and second pads. At the beginning of the end portions in a region of the printed circuit board on a first lateral side of the first pad both the first and second signal traces split into two branches. One branch each from the first and second signal traces traverses a path around a top side of the first pad and the remaining branches from the first and second signal traces traverse a path around the bottom side of the first pad. The branches of the first and second signal traces come together again in a region of the printed circuit board on a second lateral side of the first pad. A terminal portion of the first signal trace extends away from the region where the two branches of the first signal trace come together again and contacts the first pad. A terminal portion of the second signal trace extends away from the region where the two branches of the second signal trace come together again in a direction away from the first pad and towards the second pad, and contacts the second pad. A projection of the run and branch portions of the second signal trace in a plane of the first layer overlaps the run and branch portions of first signal trace up to the point where the branches come together again.
Abstract:
A display device includes a display panel including a display area, a first driving IC chip and a second driving IC chip, which are disposed with an interval along an end edge of the display panel, a cascade wiring line which connects the first driving IC chip and the second driving IC chip on the display panel, and a wiring board with a comb-shaped end portion having a first projection portion and a second projection portion, the wiring board being connected to the display panel such that the first projection portion and the second projection portion are electrically connected to the first driving IC chip and the second driving IC chip, with the cascade wiring line being interposed between the first projection portion and the second projection portion, wherein the cascade wiring line is exposed from the wiring board.
Abstract:
Disclosed is a connection arrangement for connecting end portions of differential pairs to pads. In the arrangement, first and second signal traces comprising the differential pair are formed in first and second layers, respectively, of a printed circuit board. Each of the signal traces has a run portion and an end portion. The end portions of the first and second signal traces are connected, respectively, to first and second pads. At the beginning of the end portions in a region of the printed circuit board on a first lateral side of the first pad both the first and second signal traces split into two branches. One branch each from the first and second signal traces traverses a path around a top side of the first pad and the remaining branches from the first and second signal traces traverse a path around the bottom side of the first pad. The branches of the first and second signal traces come together again in a region of the printed circuit board on a second lateral side of the first pad. A terminal portion of the first signal trace extends away from the region where the two branches of the first signal trace come together again and contacts the first pad. A terminal portion of the second signal trace extends away from the region where the two branches of the second signal trace come together again in a direction away from the first pad and towards the second pad, and contacts the second pad. A projection of the run and branch portions of the second signal trace in a plane of the first layer overlaps the run and branch portions of first signal trace up to the point where the branches come together again.
Abstract:
A power distribution system for integrated circuits includes methods to damp resonance between a bypass capacitor network and a power/ground cavity of the printed circuit board that (a) does not require excessive quantities of bypass/damping components or (b) does not require high plane cavity capacitance or in the alternative can insure a Q of less than 1.4 at the transition from the bypass network to the plane cavity impedance cross-over.
Abstract:
A transmitter IC is disposed on a first substrate. The transmitter IC supplies a pair of differential signals. A pair of bus lines is disposed on the first substrate. The pair of bus lines has each connection to receive the pair of differential signals. A terminating register is disposed on the first substrate. The terminating register is electrically connected to one end of the pair of bus lines. N pairs of first branch lines are disposed on the first substrate. Each of the N pairs of first branch lines is branched from the pair of bus lines. N pairs of second branch lines are disposed on a second substrate. Each of the N pairs of second branch lines is electrically connected to each of the N pairs of first branch lines. N units of receiver ICs are disposed on a third substrate. Each of the N units of receiver ICs is electrically connected to each of the N pairs of second branch lines. Relationship between a common mode impedance Z1 of the first branch lines and a common mode impedance Z2 of the second branch lines is 0.8·Z1≦Z2≦1.2·Z1.