摘要:
A printed circuit board includes a layer. A layer of copper is covered on a surface of the layer. A through hole extends through the printed circuit board. A thermal engraving is defined in the surface of the layer, surrounding the through hole and without being covered by the layer of copper. The thermal engraving includes a first opening and a second opening. The first opening of the thermal engraving faces an output terminal of the power supply, and is non-contiguous with the second opening.
摘要:
A printed circuit board includes a layer. A layer of copper is covered on a surface of the layer. A through hole passes through the printed circuit board. An approximately C-shaped thermal engraving is defined in the surface of the layers, surrounding the through hole and without being covered by the layer of copper. An opening of the thermal engraving faces an output terminal of the power supply.
摘要:
A printed circuit board includes a first layout layer, a second layout layer, a copper foil layer, a first via and a second via. The first layout layer has a first signal line and a second signal line, each of which has a curved first portion. The second layout layer has a third signal line and a fourth signal line, each of which also has a curved first portion. The curved first portions of the first signal line, the second signal line, the third signal line and the fourth signal line are coupled to the first via and the second via. In this case, the curved first portions of the first signal line, the second signal line, the third signal line and the fourth signal line cooperatively generate spiral inductance characteristic.
摘要:
A printed circuit board includes a layer. A layer of copper is covered on a surface of the layer. A through hole passes through the printed circuit board. A number of thermal engravings are defined in the layer around the through hole. Each thermal engraving is a groove defined in the surface of the layer, without covered with the layer of copper. The number of thermal engravings are not in contact with each other.
摘要:
A printed circuit board (PCB) includes a power layer having a base portion, and at least two extending portions. The at least two extending portions are extended from edges near at least one corner of the base portion for preventing the PCB from forming constructive interferences and lowering the resonance magnitude thereof.
摘要:
A FPCB includes a signal layer, a ground layer, and a dielectric layer lying between the signal layer and the ground layer. At least one high speed signal transmission line is formed on the signal layer. The ground layer has a copper-removed area corresponding to the transmission line. Two ground lines are symmetrically disposed at two opposite sides of the signal transmission line and substantially parallel to the signal transmission line, each ground line and the signal transmission line is spaced at a first predetermined distance. Each ground line and the signal transmission line are spaced at a first predetermined distance.
摘要:
A circuit topology for multiple loads includes a driving terminal for transmitting a driving signal, a number of transmitting lines, and a number of loads operable to receive the driving signal from the driving terminal. The number of loads are connected to the driving terminal one by one via the number of transmitting lines. Two transmitting lines of the number of transmitting lines, which are nearest and farthest respectively from the driving terminal, are both greater than widths of the other transmitting lines.
摘要:
A capacitor includes at least two electrode layers opposite to each other and a dielectric layer positioned between the at least two electrode layers. The at least two electrode layers have opposite polarities. Each electrode layer includes a positive electrode and a negative electrode. The positive electrode includes a plurality of first coupling portions spaced substantially evenly and arranged in parallel. The negative electrode includes a plurality of second coupling portions spaced substantially evenly and arranged in parallel. The positive electrode and the negative electrode of each electrode layer are coplanar, and the plurality of first coupling portions interlace with the plurality of second coupling portions.
摘要:
A method for setting a signal-equalizing system for use in an electronic device includes the following steps. Outputting a connection status of each channel and a number of misconnect options respectively associated with each channel to a display unit of the electronic device. Then, detecting whether at least one misconnect option is selected. If yes, determining a misconnected channel and adjusting the receiving setting for the receiving port of the misconnected channel to match with the transmitting setting for the transmitting port of the misconnected channel according to settings for each channel stored in the electronic device. The stored settings for each channel include a transmitting setting for the transmitting port of the channel and a receiving setting for the receiving port of the channel that matches the transmitting setting.
摘要:
An exemplary antistatic circuit board includes a first outer layer, a second outer layer, a first ground layer, and a second ground layer. The first ground layer and the second ground layer are positioned between the first outer layer and the second outer layer. The first ground layer is adjacent to the first outer layer and the second ground layer is adjacent to the second outer layer. The antistatic circuit board defines two position holes each penetrating through the first ground layer and the second ground layer. Two circuit grounds are wired on the first ground layer and the second ground layer, respectively. The second ground layer further includes a chassis ground. Each of the position holes also penetrates through the chassis ground.