Data processing: structural design – modeling – simulation – and em – Simulating electronic device or electrical system
Reexamination Certificate
1998-05-19
2001-09-04
Teska, Kevin J. (Department: 2123)
Data processing: structural design, modeling, simulation, and em
Simulating electronic device or electrical system
C716S030000, C716S030000
Reexamination Certificate
active
06285973
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to an apparatus for, and a method of, calculating the strength of an electromagnetic field radiated from an electric circuit device, and a medium for recording a program that achieves the method. In particular, the present invention relates to a technique of preparing primary data in a simulation tool such as these apparatus, method, and medium.
2. Description of the Related Art
The strength of an electromagnetic field radiated from an electric circuit device is calculated based on analytic data for the electric circuit device.
Prior Arts of calculating electromagnetic field strength according to the analytic data are disclosed in Japanese Unexamined Patent Publications No. 7-234890, No. 7-302277, No. 7-302278, No. 7-302258, No. 8-122377, No. 8-304491, No. 8-304492, No. 8-304493, and No. 8-304494.
To prepare the analytic data for an electric circuit device, an apparatus for calculating electromagnetic field strength must form models of printed circuit boards, cables, a cabinet, etc., of the electric circuit device. To prepare the models, primary data about the models must be prepared. The primary data must be quickly, efficiently, and easily prepared even by a novice having no skill in the field.
A prior art asks a user to enter mesh intervals as primary data for an object and prepares geometrical data for the object according to a known meshing technique with the use of the mesh intervals. The mesh intervals serve as units for analyzing an electromagnetic field radiated from the object.
To prepare the analytic data for an electric circuit device, it is necessary to collect primary data such as parameters and electric conditions to operate the electric circuit device. These parameters include the voltage levels of CMOSs, TTLs, and LSIs of the electric circuit device and the rising timing, falling timing, delay, pulse cycle, and pulse width of signals used by the electric circuit device.
In setting the mesh intervals, parameters, and electric conditions, the prior art relies on the skill of the user.
It is difficult for the prior art to maintain the same analysis conditions on each electric circuit device because the mesh intervals, for example, of even the same electric device are set differently depending on users. If the mesh intervals are too large, the accuracy of calculated electromagnetic field strength will be coarse, and if they are too small, a long time is needed for data preparation and strength calculation.
If the user is a novice, he or she will hardly understand the contents of the primary data for the strength calculation and have to refer to manuals. This takes a long time, and the user may not always select optimum parameters. Then, a result of the calculation fluctuates each time depending on the skill of the user, thereby deteriorating the efficacy and reliability of the calculation.
Learning how to prepare the primary data for calculating the electromagnetic field strength demands much labor of the user.
SUMMARY OF THE INVENTION
An object of the present invention is to provide an apparatus for and a method of easily and quickly preparing analytic data necessary for calculating the strength of an electromagnetic field radiated from an electric circuit device, even by a person having no skill in the field. The present invention also provides a medium for recording a program that achieves the method.
In order to accomplish the objects, the present invention provides an apparatus for and a method of calculating the strength of an electromagnetic field radiated from an electric circuit device according to analytic data. The apparatus and method employ a navigation file, a display unit, and a modeler. The navigation file stores procedures that at least include a procedure for prompting a user to enter the external dimensions of the electric circuit device and a procedure for prompting the user to enter signal frequencies on which the electric circuit device is divided into meshes and analyzed. The display unit sequentially displays the procedures so that the user may interactively set primary data according to the displayed procedures. The modeler prepares a model of the electric circuit device according to the primary data. The model is used to find analytic data to calculate the strength of the electromagnetic field. The present invention also provides a medium for recording a program that achieves the method.
The present invention enables the user to interactively enter primary data for a target electric circuit device according to procedures displayed on the display unit, and prepares a model of the target device according to the primary data. The model is used to calculate the strength of an electromagnetic field radiated from the target device. The present invention enables even a novice having no skill in preparing primary data to easily and quickly set optimum primary data. Namely, the present invention is capable of efficiently and correctly calculating the strength of an electromagnetic field always under the same analysis conditions without relying on a user's skill.
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Nagase Kenji
Nishino Sekiji
Frejd Russell W.
Fujitsu Limited
Staas & Halsey , LLP
Teska Kevin J.
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