Patent ID: 7839135
Filing Date: 2010-11-23
Classification: G06F

Abstract:
1. A printed board carrying chassis analyzing system comprising: printed board information input means for inputting the longitudinal and transverse dimensions of a printed board to be mounted on a chassis and the distance between confronting surfaces of the printed board and the chassis; physical constant input means for inputting information as to the loss value of a conductor of the printed board, an analyzing frequency range, and the positions of a noise source and an observation point; grounding post layout specifying means for inputting information as to the number and layout of grounding posts and circuit constants of grounding posts; mesh information input means for inputting information as to a mesh number or a mesh interval to generate an equivalent circuit model between the printed board and the chassis which confront each other; between-printed-board-and-chassis equivalent circuit constant calculating means for generating an equivalent circuit by applying a parallel plate model with respect to meshes specified by said mesh information input means, incorporating circuit constants obtained by said grounding post layout specifying means into said equivalent circuit in regions where a grounding post is present and then calculating overall circuit constants, specifying a node closest to the position of the noise source obtained by said physical constant input means as a current source, and specifying a node closest to the observation point obtained by said physical constant input means as an observation point; resonant characteristic calculating means for analyzing a circuit with a circuit solver, using information obtained by said between-printed-board-and-chassis equivalent circuit constant calculating means, and calculating a voltage distribution at the observation point in the frequency range obtained by said physical constant input unit; and resonant characteristic displaying means for displaying information obtained by said resonant characteristic calculating unit means as a graph having a vertical axis that is representative of calculated values of voltages at observation points obtained by said physical constant input means and a horizontal axis that is representative of frequencies obtained by said physical constant calculating unit, and displaying voltage peaks at resonant frequencies.