Abstract: A computing device and a method measures scattering parameters (S-parameters) values at ports of a circuit at different signal frequencies, and creates a non-common-pole rational function of S-parameters by applying a vector fitting algorithm to the S-parameters. A matrix of the non-common-pole rational function is converted to a state-space matrix, and the state-space matrix is substituted into a Hamiltonian matrix. The device and method further analyzes if eigenvalues of the Hamiltonian matrix have pure imaginaries, to determine if the non-common-pole rational function of the S-parameters satisfies a passivity requirement.

Abstract: A direct current compensation method for S-parameter rational functions reads S-parameters f(sk), which are generated at given frequency sk, from a storage unit. An S-parameter, which is generated at frequency sk=0 is supplemented into the S-parameters f(sk), upon the condition that there is no S-parameter which is generated at the frequency sk=0. An S-parameter ration function is generated according to the S-parameters f(sk). A DC level of the S-parameter rational function is compensated to generate a compensated S-parameter rational function.

Abstract: A system and method for testing objects using a mechanical arm includes establishing coordinate system based on a work area of the mechanical arm, and obtaining test parameters from a storage system. The method further includes controlling the mechanical arm to get an object and position the object to the position of a test platform according to the test parameters, controlling the mechanical arm to get test tool from a tool shelf and position the test tool to a position of test point on the object to test the object according to the test parameters. The method also includes controlling the mechanical arm to get the object from the test platform and position the object to the location reserved for the object according to the test parameters.

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.

Abstract: A simulation system for producing equivalent circuits reads data corresponding to a tabular W element format in a storage device, and adds data of the tabular W element format file using interpolation algorithm. A frequency-dependent transmission matrix is transformed into an N-port network matrix describing electrical properties of a multi-input and multi-output network. An N-port network matrix is transformed into a S-parameter matrix. A range of frequency of a s-parameter is determined and numbers of pole-residue, times for recursion and durable maximum system errors in the equivalent circuit is also determined. A a vector fitting algorithm is performed and a rational function matrix composed with s-parameters is produced, to produce a general SPICE equivalent circuit based on the generated rational function matrix.

Abstract: A system and method uses a measurement control device and a measurement machine to measure pin voltages of electronic components installed in an electronic device. The measurement control device controls a mechanical arm of the measurement machine to move to the pins of the electronic components according to coordinates of the pins. A voltage probe installed on the end of the mechanical arm can measure voltages of the pins automatically.

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.