Abstract: A printed circuit board includes first and second transmission lines connected to a first high speed differential signal control chip, third and fourth transmission lines connected to a second high speed differential signal control chip, and fifth and sixth transmission lines connected to a connector pad. To have the first high speed differential signal control chip communicate with the connector pad, the first transmission line is connected to the fifth transmission line through a first connection component, and the second transmission line is connected to the sixth transmission line through a second connection component. To have the second speed differential signal control chip communicate with the connector pad, the third transmission line is connected to the fifth transmission line through the first connection component, and the fourth transmission line is connected to the sixth transmission line through the second connection component.

Abstract: A robotic arm control system is provided. In, the robotic arm control system, any three points A, B, and C of an object to be determined are picked, thereby creating an original coordinate system. A robotic arm is directed to rotate around the x-axis of the original coordinate system to reach the points B and C. During the rotation of the robotic arm, the three points A, B, and C are recorded by a visual process. A non-linear mapping relation of the original coordinate system and the operation coordinate system is calculated according to length ratios, an angular ratio, and a differential ratio of the difference of the length ratios to the angle between the line A-B and the line A-C, thereby controlling the movement of the robotic arm according to the non-linear mapping relation. The disclosure further provides a robotic arm control method.

Abstract: In a method for testing integrity of signals transmitted from hard disk interfaces using a computing device, the computing device connects to an oscilloscope and a mechanical arm that is equipped with a test fixture. The mechanical arm controls the test fixture to make contact with one of the hard disk interfaces to be tested. The method adjusts an intensity grade of the signals through the hard disk interface, and controls the hard disk interface to produce a signal corresponding to the adjusted intensity grade. The test fixture obtains the signal from the hard disk interface, and the oscilloscope measures one or more test parameters of the signal. The method analyzes values of the test parameters to find an optimal signal, determines an intensity grade of the optimal signal as a driving parameter of the hard disk interface, and generates a test report of the hard disk interfaces.

Abstract: In a method for testing serial attached SCSI (SAS) ports of a server using a computing device, the computing device connects to an oscilloscope and a mechanical arm that is equipped with a test fixture having a probe. The mechanical arm controls the probe to be plugged into one of the SAS ports. The method adjusts an intensity grade of the SAS signals through the SAS port, and controls the SAS port to generate a SAS signal corresponding to the intensity grade. The test fixture obtains the SAS signal from the SAS port, and the oscilloscope measures test parameters of the SAS signal. The method analyzes values of the test parameters to find an optimal SAS signal, determines an intensity grade of the optimal SAS signal as a driving parameter of the SAS port, and accordingly generates a test report of the SAS ports.

Abstract: In a method for analyzing integrality of serial attached SCSI (SAS) signals using a computing device, the computing device connects to a signal measuring device and an electronic device. A group of test parameters, an intensity grade of a SAS signal, and a total number are set for evaluating integrality of the SAS signal. The intensity grade of the SAS signal is adjusted through an SAS interface of the electronic device. The signal measuring device measures test parameters of the SAS signal, and a test number is recorded when the test parameters of the SAS are measured. The method analyzes the integrality of the SAS signal to find an optimal SAS signal when the test number equals the total number, and determines an intensity grade of the optimal SAS signal as a driving parameter of the SAS interface.

Abstract: In a method of managing process factors that influence electrical properties of printed circuit boards (PCBs), n process factors are arranged in an order according to different influence to one kind of electrical property of the PCBs. The different influence is determined by first experiments designed using the Taguchi method. M process factors that have important influence to the electrical property are obtained from the n process factors according to the order to design second experiments. A computing formula for the electrical property is fitted using the m process factors according to simulated results of the second experiments, and a variation range of each of the m process factors is computed according to the computing formula.

Abstract: In a method for inspecting the layout of a printed circuit board (PCB), a component to be checked is determined from an electronic layout diagram of the PCB, and a power transmission line which may be serving that component is selected. The layout diagram is checked to determine whether the component is connected to the power transmission line, and further checked to determine whether more than one ground pins of the component is connected to the power transmission line. Vias that are shared by two or more ground pins of the component are determined if more than one ground pin is connected to the power transmission line. Shared vias are marked on the layout diagram.

Abstract: In a method for regulating a mechanical arm using a control computer. The method obtains a first position and a second position of a center of an image plane of an image capturing device on the mechanical arm by controlling movements of the mechanical arm, and calculates a movement vector from the first position to the second position. The method further calculates a regulating angle according to the movement vector and an axial vector of the mechanical arm, and moves the mechanical arm according to the regulating angle such that the axial vector is perpendicular to a measurement plane determined by the first object and the second object.

Abstract: A printed circuit board includes a high-speed differential signal control chip, first to eighth coupling capacitor pads, first to fourth connector pads, a first transmission line, a second transmission line, a third transmission line, a fourth transmission line, first to eighth transmission lines, two ninth transmission lines, first and second vias, and first to fourth sharing pads. The printed circuit board is operable to selectively support multiple connectors.

Abstract: In a method for inspecting the layout of a printed circuit board (PCB), a component to be checked is determined from an electronic layout diagram of the PCB, and a power transmission line which may be serving that component is selected. The layout diagram is checked to determine whether the component is connected to the power transmission line, and further checked to determine whether more than one ground pins of the component is connected to the power transmission line. Vias that are shared by two or more ground pins of the component are determined if more than one ground pin is connected to the power transmission line. Shared vias are marked on the layout diagram.

Abstract: In a method for checking layout of a printed circuit board (PCB) using an electronic device, a power line is selected from a layout diagram of the PCB. The method searches for one or more signal lines which are overlapping with the selected power line from the layout diagram of the PCB. The method further locates attribute data of the searched signal lines and the selected power line in the layout diagram of the PCB, and displays the attribute data of the searched signal lines and the selected power line on a display device of the electronic device.

Abstract: A differential signal transmission device transmits N differential signal pairs from a differential signal generator to a number of receiving terminals. The N differential signal pairs include N positive signals and N negative signals. The N positive signals are clustered at a first positive clustering point. The first positive clustering point is connected to a second positive clustering point via a first matching resistor. The second positive clustering point is grounded via a first grounding resistor, and outputs a number of positive signals to the number of receiving terminals respectively. The N negative signals are clustered at a first negative clustering point. The first negative clustering point is connected to a second negative clustering point via a second matching resistor. The second negative signal clustering point is grounded via a second grounding resistor, and outputs a number of negative signals to the number of receiving terminals respectively.

Abstract: A printed circuit board (PCB) with compound via includes a substrate and a pair of through holes passing through the substrate. The substrate includes a signal layer which is the top layer of the substrate, a first reference layer adjacent to the signal layer, and a second reference layer not adjacent to the signal layer. A first and a second pair of pads are mounted on the signal layer. Each of the through holes extends through the first pair of pads such that the through hole and the first pair of pads jointly form a compound via. A first reserved opening is formed on the first reference layer and corresponds to the first and the second pair of pads and the compound via. A second reserved opening is formed on the second reference layer and surrounds the through hole thereon.

Abstract: A design method generates a plurality of groups of experimental conditions, each of the groups of experimental conditions includes performance variables for an electronic product with nonlinear performance. The method simulates values to the groups of experimental conditions, computes an average value, and divides the groups of experimental conditions into a first part and a second part. The values in the first part is greater than the average value and the values in the second part is less than the average value. The method computes nonlinear boundary values of a refining mechanism based on the values, and determines a threshold value of the refiner. After refining the groups of experimental conditions, the method calculates the deviation of each value from the threshold value, and determines the groups of experimental conditions with the greatest deviations as optimal groups of experimental conditions.

Abstract: A printed circuit board includes first and second transmission lines connected to a first high speed differential signal control chip, third and fourth transmission lines connected to a second high speed differential signal control chip, and fifth and sixth transmission lines connected to a connector pad. To have the first high speed differential signal control chip communicate with the connector pad, the first transmission line is connected to the fifth transmission line through a first connection component, and the second transmission line is connected to the sixth transmission line through a second connection component. To have the second speed differential signal control chip communicate with the connector pad, the third transmission line is connected to the fifth transmission line through the first connection component, and the fourth transmission line is connected to the sixth transmission line through the second connection component.

Abstract: In a method of optimizing parameters of electronic components on printed circuit boards (PCBs), a first experiment table for m variables of one type of parameter of P electronic components on a PCB is designed using n values of each variable and the RSM. P EHs of each first experiment are obtained by simulating, and P EH empirical formulas are computed according to the P EHs. A second experiment table for the m variables is designed using n? values of each variable and the full factorial design, and P EHs of each second experiment are computed using the P EH empirical formulas. Experiments, all the P EHs of which are greater than 1, are filtered from the second experiment tables, and an average EH of each filtered experiment is computed to pick an experiment the average EH of which is the greatest. The values of the m variables in the picked experiment are considered as optimized.

Abstract: A computing device and a method involves selection of one or more transmission lines from a printed circuit board (PCB) layout file, reading a transmission line from the one or more selected transmission lines, and determining neighboring anti-pads of the read transmission line in the PCB layout file. The computing device and method further determine an actual distance between the read transmission line and a neighboring anti-pad. If the actual distance is less than a preset standard distance, the computing device and method determine that the read transmission line and the neighboring anti-pad do not satisfy design requirements, and highlight the read transmission line and the neighboring anti-pad, to prompt a user to amend design of the read transmission line and the neighboring anti-pad.

Abstract: A printed circuit board can support different connectors by selectively setting connection components on the printed circuit board without changing wiring of transmission lines or making new vias in the printed circuit board.

Abstract: A computer motherboard includes a printed circuit board which includes a central processing unit (CPU) socket and a group of memory slots. The group of memory slots includes an in-line type memory slot and a surface mounted device (SMD) type memory slot. The in-line type memory slot includes a number of plated through holes. The SMD type memory slot is set between the in-line type memory slot and the CPU socket. The through holes of the in-line type memory slot are connected to the CPU socket through traces, pads of the SMD type memory slot are connected to corresponding through holes of the in-line type memory slot having the same pin definition.

Abstract: A system and method for extracting feature data of dynamic objects selects sequential N frames of a video file up front, where N is a positive integer, and divides each of the N frames into N*N squares. The system and method further selects any n frames from the N frames, selects any n rows and n columns of the n frames to obtain n*n*n squares, where n is a positive integer. The system and method further extracts feature data from the video file by computing averages and differences for pixel values of the n*n*n squares.