Fujitsu Corporation

Megumi Nagata

Masaki Tosaka

Makoto Suwada

Hikoyuki Kawata

Hiroyuki Orihara

Kazuhiko Tokuda

Jiro Yoneda

Tatsuo Koizumi

Toshio Karino

A circuit simulator includes: a DC analysis section which analyses a static stable potential on a transmission circuit if a capacitor which blocks a DC current while allowing an AC current to pass therethrough is connected in series in the line of the transmission circuit; and an initial potential application section which applies, as an initial potential in the simulation, the stable potential obtained by the DC analysis section to an application position on the upstream side of the capacitor in the flow of the signal through the transmission circuit. The simulator also includes a circuit simulation section which performs the simulation of the transmission circuit under the initial potential applied by the initial potential application section.

Transmission circuit simulator and transmission circuit simulation program storage medium

A circuit analyzing apparatus for analyzing operation characteristics of a circuit unit in which, on a substrate, circuit devices are arranged, has a part for automatically obtaining a value of a substrate parameter concerning the substrate for an operating frequency, which value depends on the operating frequency; and a part for analyzing operation of the circuit unit based on the value of the substrate parameter for the operating frequency.

Circuit analyzing apparatus, circuit analyzing method and circuit analyzing program

A simulation method makes a noise analysis based on parameters including a conductor resistance which takes skin effect into consideration. The simulation method calculates a first resistance of one of conductors having a largest cross sectional area, obtains a predetermined pitch which saturates a diagonal component of a second resistance of a conductor with reference to the first resistance and makes the diagonal component approximately constant, by varying a pitch of the conductors, calculates the parameters for each pitch with respect to one of the pitches larger than or equal to the predetermined pitch and the pitches smaller than the predetermined pitch, and substitutes the parameters calculated for the one of the pitches with respect to the other of the pitches, and outputs calculation results.

Simulation method and apparatus, and computer-readable storage medium

The apparatus comprises the syntax checking section that checks the syntax of a device model according to a check table showing the relation between the syntax of the device model showing electrical characteristics of a semiconductor device and an amendment when deviating from the syntax. The syntax error amendment creating section corrects the device model according to a corresponding amendment when a description deviating from the syntax is checked by the syntax checking section.

Method of and apparatus for automatically correcting device model, and computer product

In a simulation considering a skin effect, a signal conductor is vertically and horizontally divided by faces parallel to the surface of the signal conductor, which are set so that intervals are smaller as the faces are nearer to the surface, and larger as the faces are farther from the surface. Also a ground conductor is vertically divided with a similar method, and an integration calculation is made, so that the resistance of the signal conductor, which corresponds to a given frequency, is obtained.

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Kawasaki, Japan

Megumi Nagata