Abstract: A system and method for checking a ground via of control chips of a printed circuit board (PCB) provides a graphical user interface (GUI) displaying a layout of the PCB. The control chip has a plurality of ground pins. The computer searches for signal path routing of each ground pin and ground vias along each signal path routing of each ground pin. If there are any ground vias having the same absolute coordinates, the computer determines that the ground vias are shared by more than one ground pin.

Abstract: 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, and thickness of each of dielectric layers can be changed. When any component needs to be replaced, the filter can be detached as needed.

Abstract: The REVERSING TRANSMISSION includes a shaft, a retainer, a spacing collar, a plurality of reversing members, two gears and two covers. The holder is sleeved on the shaft with spaced sliding notches formed thereon. The spacing collar is mounted on an outer surface of the retainer. The reversing members each includes two spaced swing plates with two reversed spiral teeth dented on two diagonal half surfaces of the two spaced swing plate. The reversing members slide into the sliding notches of the holder with two swing plates distributed at different side of the spacing collar. Each of the gears has a group of spiral teeth formed on the inner side for engaging with the group of spiral teeth of the reversing members, and cogs formed on the outer circumference surface. The covers are mounted on two opposite ends of the holder to keep the reversing member in position.

Abstract: A printed circuit board includes a high-speed differential signal control chip, first to fourth coupling capacitor pads, first and second connector pads, first and second inductor pads, a number of transmission lines, a power pin, two sharing pads, and two selection pads. Two coupling capacitors can selectively connect the first and second coupling capacitor pads and the two sharing pads or between the third and fourth coupling capacitor pads and the two sharing pads, respectively. Two inductors can connect the first and second inductor pads and the two selection pads respectively, and the first and second inductor pads and the two selection pads can be void.

Abstract: An automatic system for providing printed circuit board (PCB) layout of a PCB includes an input device, a data processing device, and a storage device. The data processing device includes an invoking module, a calculating module, and a determining module. The invoking module is to read a name and a thickness of each layer of the PCB from the storage device. The calculating module is to calculate an actual length of a via stub of each layer according to the name and thickness of each layer, and calculate an ideal length of the via stub of the PCB according to input information from the input device, and a preset formula. The determining module is to compare the ideal length and the actual length of the via stub of each layer to determine whether the layer can be used as a high-speed signal layout layer or not.

Abstract: 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 move to two slots of a resisting portion, to detach the filter.

Abstract: 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 move to two slots of an insulation portion, to detach the filter.

Abstract: 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.

Abstract: A system and method for inspecting layout of a printed circuit board (PCB) provides a graphical user interface (GUI). The GUI displays a layout of the PCB. High side pins of a pulse width modulation (PWM) controller and a component connected to a high side pin are found. If the component is a metallic oxide semiconductor field effect transistor (MOSFET), the system calculate absolute a linear distance and a trace distance between a source pin of the MOSFET and a capacitor pin of a coupling capacitor connected to the source pin. If the linear distance, the trace distance and a capacitance of the coupling capacitor accord with a layout standard, the layout of the PCB is determined to be up to standard.

Abstract: A system and method generates a test file of a print circuit board (PCB). The system and method loads trace information of the PCB into a storage system of a test computer, searches the storage system for the trace information matching keywords received and selects traces to test from the searched results. The system and method further acquires length and test points of each selected trace, and sets test parameters of each test item. In addition, the system and method generates a test file of the PCB according to the test parameters, the length, and the test points of each selected trace.

Abstract: A method and system for designing a circuit board designs wiring of the circuit board, and determines electronic rules and physical rules of the wiring design. The method and system creates a board file by designating a file name, outputs the electronic rules into the board file, and outputs the physical rules into the board file according to a preset output format. The method and system further generates a circuit diagram according to preset initial parameters, and applies the electronic rules and the physical rules to the circuit diagram according to the board file.

Abstract: 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.

Abstract: A method for testing a characteristic impedance of a signal path routing of a printed circuit board (PCB) controls the test device to test a characteristic impedance of the signal path routing of the PCB to get test data of the signal path routing of the PCB. The method further analyzes the test data of the signal path routing of the PCB get analysis results, generate a test report for storing the test data of each signal path routing of the PCB and the analysis results if all signal path routings of the PCB have been tested.

Abstract: A printed circuit board includes a signal layer and a power layer. A differential pair with two transmission lines is set on the signal layer. A cross-trench portion is formed in the power layer. A first width of each transmission line which is not located above the cross-trench portion is less than a second width of the transmission line which is located above the cross-trench portion. A first distance between the two transmission lines which are not located above the cross-trench portion is greater than a second distance between the two transmission lines which are located above the cross-trench portion.

Abstract: A method for testing a characteristic impedance of an electronic component includes sending a positioning command to a control computer through a switch, so as to drive a probe holder of a mechanical arm to position probes of a time domain reflectometer (TDR) on a position of the electronic component. The method further receives measured data collected by the TDR, and compares the measured data with preset standard values to determine if the measured data is acceptable.

Abstract: A computer-aided design system and method are provided. The computer-aided design method reads PCB design data from a storage system, obtains a plurality of circuit signals from the PCB design data, and groups the differential signals into a plurality of differential signal pairs. The computer-aided design method further sets a signal design standard for each of the differential signal pairs according to the electrical characteristics of the differential signal pair, and compiles each of the signal design standards into an instruction set. In addition, the computer-aided design method generates a PCB design specification by integrating each of the instruction sets and the PCB design data, and stores the PCB design specification into the storage system.

Abstract: An automatic system for providing printed circuit board (PCB) layout of a PCB includes an input device, a data processing device, and a storage device. The data processing device includes an invoking module, a calculating module, and a determining module. The invoking module is to read a name and a thickness of each layer of the PCB from the storage device. The calculating module is to calculate an actual length of a via stub of each layer according to the name and thickness of each layer, and calculate an ideal length of the via stub of the PCB according to input information from the input device, and a preset formula. The determining module is to compare the ideal length and the actual length of the via stub of each layer to determine whether the layer can be used as a high-speed signal layout layer or not.

Abstract: A system, storage medium, and method for structuring data are provided. The system connects to a storage device that stores original data. The method obtains the original data from the storage device, and stores the original data in the form of character strings into a buffer memory according to end of file-line (EOF) tags. The method further constructs data arrays to store the character strings, and arranges each of the data arrays into a data matrix. In addition, the method classifies each of the data arrays in the data matrix according to properties of the character strings, arranges the classified data arrays into a data file, and stores the data file into the buffer memory.

Abstract: A printed circuit board coupling includes a first layout layer, a second layout layer, a pair of connecting portions, a first component and a second component. The first layout layer has a pair of first conducting portions which is disposed thereon to couple with a control chip. The second layout layer has a pair of second conducting portions, third conducting portions, and fourth conducting portions all of which are sequentially disposed thereon. The connecting portions are coupled with the first conducting portions and the third conducting portions. In a first coupling mode, an electronic device is coupled with the second conducting portions, and first and second components are coupled with the third and fourth conducting portions. In a second coupling mode, the electronic device is coupled with the fourth conducting portions, and the first and the second components are coupled with the second and third conducting portions.

Abstract: 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.