Cad apparatus for designing pattern of electric circuit

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364488, G06F 1750

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active

054043093

ABSTRACT:
A CAD apparatus for designing a pattern of an electric circuit, is provided with: a printed resistor shape parameter storing unit for storing values of printed resistor shape parameters including a maximum aspect ratio and a minimum aspect ratio of a printed resistor, which pattern is to be designed; a resistor parameter storing unit for storing values of resistor parameters including a necessary resistance of the printed resistor; a resistor material table storing unit for storing a resistor material table including names of various resistor materials and resistances per unit area of the various resistor materials correspondingly; and an optimum resistor material name storing unit for storing an optimum resistor material name of the printed resistor. The CAD apparatus is also provided with an optimum resistor material selecting unit for calculating aspect ratios of the various resistor materials according to a predetermined rule based on the resistances of the various resistor materials and the necessary resistance, selecting the optimum resistor material according to a predetermined rule based on the values of the calculated aspect ratios and the values of the maximum and minimum aspect ratios, and storing the name of the selected optimum resistor material into the optimum resistor material name storing unit.

REFERENCES:
patent: 4891242 (1990-01-01), Ito et al.
patent: 5064711 (1991-11-01), Ito et al.
Proceedings 5th International Microelectronics Conference, Aug. 25, 1988, Tokyo JP pp. 558-563 (Ventham, et al).
Electronic Design, Mar. 7, 1985 pp. 115-122 (Miller).

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