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:
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:
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 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 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 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:
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:
In an electronic device and a method of generating composite electrical signals, a plurality of post-processing software is installed. An output file, which comprises times and voltages of data points that represent an electrical signal, of an electronic circuit simulation software is loaded, and is read using the installed post-processing software. A time interval of outputs of the electrical signal is obtained by selecting an output type of the electrical signal. The worst bit combination of outputs of the electrical signal is analyzed according to the times, the voltage, and the time interval, and a composite electrical signal is generated according to the worst bit combination.
Abstract:
A simulation system and method for generating equivalent circuits compatible with HSPICE reads data corresponding to N-port network system format in a storage device, and obtains S-parameter matrixes from the N-port network system. S-parameters in the S-parameter matrix that satisfy passivity are checked, and an interpolation algorithm to supplement S-parameters with passivity when some S-parameters not satisfy passivity is performed. Numbers of pole-residue, times for recursion and a tolerant system error of a rational function are generated for determining S-parameters. A rational function matrix composed of S-parameters is generated by performing a vector fitting algorithm, and an equivalent circuit is generated compatible with HSPICE format based on the generated rational function matrix.