Patent ID: 7861194
Filing Date: 2010-12-28
Classification: G06F,H01L

Abstract:
1. An apparatus for calculating wiring capacitance of a target wiring based on adjacent wirings that are located adjacent to the target wiring, the apparatus comprising: a first basic capacitance calculating unit that calculates first basic capacitance that is wiring capacitance between the target wiring and an adjacent wiring above the target wiring, between the target wiring and an adjacent wiring below the target wiring, between the target wiring and an adjacent wiring on a left side of the target wiring, and between the target wiring and an adjacent wiring on a right side of the target wiring; a diagonal-capacitance calculating unit that calculates diagonal capacitance that is wiring capacitance between the target wiring and an adjacent wiring in a diagonally upward direction from the target wiring and between the target wiring and an adjacent wiring in a diagonally downward direction from the target wiring; a second basic-capacitance calculating unit that calculates second basic capacitance based on the calculated diagonal capacitance by correcting the first basic capacitance by taking into account an influence due to the calculated diagonal capacitance; and a total-capacitance calculating unit that adds up the diagonal capacitance calculated and the second basic capacitance, to calculate the wiring capacitance, wherein the first basic capacitance and the diagonal capacitance are dependent on each other.