Fujitsu Corporation

Yuji Suwa

Yasuhiro Yoneda

Toshihiro Kusagaya

Daisuke Mizutani

Toshiro Sato

Kazuhiko Iijima

Atsushi Takeuchi

Kenji Nagase

Masaki Tosaka

Toshiaki Sato

Yasuhiro Yamashita

Yoshiyuki Iwakura

Eiji Ohta

Jiro Yoneda

Kumiko Teramae

Kazunari Gotou

Kazuyoshi Kanei

An analyzing apparatus includes a result-data storing unit that determines whether result data that is calculated as a result of analysis is restorable by linear interpolation. If the result data is determined to be unrestorable by the linear interpolation, the result-data storing unit stores the result data in a predetermined storage unit. Moreover, the analyzing apparatus includes a data restoring unit that reads the result data from the storage unit. The data restoring unit performs the linear interpolation using the result data acquired, thereby restoring the result data.

Analyzing apparatus and data storage method

An inexpensive multilayer wiring circuit board capable of conducting high frequency switching operation on the circuit while the generation of high frequency noise is being suppressed by reducing the inductance of the circuit in provided. A multilayer wiring circuit board with an uppermost layer designated as a first layer on which parts are mounted; a second layer on which one of a ground layer and an electric power source layer is arranged; a third layer on which the other is arranged; and an insulating layer arranged between the ground layer and the electric power source layer. A resin layer having a thermoplastic adhesion property on both faces is used as material of the insulating layer arranged between the electric power source layer and the ground layer.

Multilayer wiring circuit board

An IBIS correction tool which can be used assembled in a waveform simulation device and corrects IBIS data for a certain specific power supply voltage Vto IBIS data for a desired power supply voltage Vwith a higher precision than the past, that is, an IBIS correction tool configured so as to read IBIS data for a power supply voltage Vas numerical data of x-y coordinates at a data input unit, find a relative ratio (correction coefficient) between this numerical data and numerical data for a power supply voltage Von its x-y coordinates at a correction coefficient calculating unit, and obtain corrected IBIS data corrected for the power supply voltage Vaccording to that correction coefficient at a corrected IBIS data generating unit.

IBIS correction tool, IBIS correction method, and waveform simulation device

An inexpensive multilayer wiring circuit board capable of conducting high frequency switching operation on the circuit while the generation of high frequency noise is being suppressed by reducing the inductance of the circuit in provided. A multilayer wiring circuit board comprising: an uppermost layer designated as a first layer on which parts are mounted; a second layer on which one of a ground layer and an electric power source layer is arranged; a third layer on which the other is arranged; and an insulating layer arranged between the ground layer and the electric power source layer. A resin layer having a thermoplastic adhesion property on both faces is used as material of the insulating layer arranged between the electric power source layer and the ground layer.

In order to achieve augmentation of the accuracy in calculation of noise and augmentation of the accuracy in a noise check which is performed, for example, when an electronic circuit is designed and further realize significant reduction of the time required for a noise check and augmentation of the operation efficiency by reduction of the man-hours of a designer in a noise analysis, a noise checking apparatus includes a model production section () for producing a simulation model of a circuit portion relating to a noticed wiring line, a simulation section () for performing a simulation using the simulation model to calculate a signal waveform which propagates in the noticed wiring line and calculate a noise waveform superposed on the signal waveform for each kind of noise, a noise waveform synthesis section () for synthesizing the signal waveform and the noise waveforms with generation timings of the noise waveforms taken into consideration to obtain a noise composite waveform, and a noise checking section () for performing noise checking based on the noise composite waveform.

Noise checking method and apparatus

Growing community of inventors

Kawasaki, Japan

Yuji Suwa