摘要:
Parameters of a radio frequency filter can be changed by changing structure of each component of the filter. Material of each component, diameters of each of magnetic cylinders, density of each of conductive coils, thickness of a dielectric layer, and thickness of an insulation tube can be changed. When any component needs to be replaced, each cover is rotated, with connection partitions moving to two slots of an insulation portion, to detach the filter.
摘要:
An apparatus for adjusting a differential probe includes a regulator arranged therein capable of adjusting a distance between two tips of the probe. The probe is supported on the apparatus. The apparatus includes a rotatable shaft and a rotatable disk. The rotatable shaft engages with the regulator of the probe. The rotatable disk is mounted surrounding the rotatable shaft and rotatable together with the rotatable shaft. An angular ruler or a radian ruler is described on an outer surface of the rotatable disk to indicate a rotation angle or a rotation radian of the rotatable shaft, therefore the distance between the two tips of the probe are accurately adjusted.
摘要:
A printed circuit board includes a plurality of differential pairs arranged thereon side-by-side. Each differential pair includes two transmission lines. Each transmission line includes a plurality of sections of equal length. Every two adjacent sections in each transmission line meet at an angle, and all angles are equal. The length of each section is determined by dividing the distance between two corresponding angles of the two transmission lines of each differential pair by the cosine of half of the angle.
摘要:
A computer system includes a motherboard with first and second storage device interfaces and first to third memory slots, and first to third serial advanced technology attachment dual-in-line memory modules (SATA DIMMs). First and second extending boards are extended from two opposite ends of each SATA DIMM, arranged with first and second edge connectors, respectively. The first edge connector of the first SATA DIMM is connected to the first storage device interface. The second edge connector of the first SATA DIMM is connected to the first edge connector of the second SATA DIMM. The second edge connector of the second SATA DIMM is connected to the first edge connector of the third SATA DIMM. The second edge connector of the third SATA DIMM is connected to the second storage device interface.
摘要:
In a method for transmitting data between a host computer and a slave device, the host computer connects to a slave device through a data communication port. The slave device is equipped with a power supply that includes at least one capacitor. The power supply is charged through the host computer using the capacitor when the host computer is powered on. The method controls the host computer sends data to the slave device, and controls the capacitor to discharge to provide power to the slave device for a period of time when the host computer is powered off, and stores the data packet into the slave device during the period of time. The method further retrieves the data from the storage device when the host computer is powered on, and resends the data to the slave device through the data communication port.
摘要:
A printed circuit board includes first and second layout layers, first and second components, and a pair of connecting portions. The first layout layer includes a pair of first conducting portions connected to a control chip. The second layout layer includes pairs of second to fourth conducting portions. The connecting portions connect the first and third conducting portions together. When an electronic device is connected to the second conducting portions, and the first and second components are connected to the third and fourth conducting portions to form a first route, signals generated by the control chip are transmitted to the electronic device through the first route. When the electronic device is connected to the fourth conducting portions, and the first and second components are connected to the second and third conducting portions to form a second route, the signals are transmitted to the electronic device through the second route.
摘要:
A serial advanced technology attachment (SATA) DIMM includes a board body. A control chip is arranged on the board body. An extending board extends from an end of the board body. A first edge connector is set on the extending board. A second edge connector is set on a bottom side of the board body. The first edge connector includes a number of signal pins connected to the control chip, and a number of ground pins.
摘要:
A printed circuit board (PCB) includes a top layer, a memory controller, two gaps, and two connectors. The memory controller is located on the top layer. A number of golden fingers are respectively set on the top layer near each gap and electrically connected to the memory controller. Each connector includes a first slot to hold the gold fingers near a corresponding one of the gaps and a second slot to hold a number of gold fingers of a corresponding one of two memory chips. The first slot is electrically connected to the second slot. Each memory chip and the PCB are coplanar.
摘要:
A printed circuit board (PCB) includes first and second signal layers. First and second pairs of signal transmission lines are respectively laid out on the first and second signal layers. The first pair of signal transmission lines includes first positive and negative differential signal transmission lines. The second pair of signal transmission lines includes second positive and negative differential signal transmission lines. The first positive differential signal transmission line is electrically connected to the second negative differential signal transmission line by a first vertical interconnect access (via). The first negative differential signal transmission line is electrically connected to the second positive differential signal transmission line by a second via. An angle between a centerline of each of the first via and second via and a surface of the PCB is an acute angle.
摘要:
A printed circuit board (PCB) includes a top layer, a memory controller, a gap, and a connector. The memory controller is located on the top layer. A number of first golden fingers are set on the top layer near the gap and electrically connected to the memory controller. A connector includes a first slot to hold the first golden fingers and a second slot to hold a number of second golden fingers of a memory chip. The first slot is electrically connected to the second slot. The memory chip and the PCB are coplanar.