Patent ID: 8910106

Claim:
A capacitor arrangement assisting method comprising: calculating by using a computer, on the basis of a width of a power supply wiring that connects a power supply terminal of an IC with a capacitor and a thickness of a dielectric provided between the power supply wiring and a ground plane, an inductance per unit length of the power supply wiring; and determining a wiring length of the power supply wiring such that a synthetic impedance, based on an impedance of the power supply wiring and an impedance of the capacitor, is smaller than or equal to a target impedance of the IC at a target frequency, wherein the impedance of the power supply wiring is calculated from an inductance of the power supply wiring set in accordance with the inductance per unit length of the power supply wiring and the wiring length of the power supply wiring, wherein the inductance per unit length of the power supply wiring is calculated as follows: L 0 = μ 0 π ⁢ ( h w ) 0.6 , where L 0 represents the inductance per unit length of the power supply wiring, h represents the thickness of the dielectric, w represents the width of the power supply wiring, and μ 0 represents the permeability of a vacuum.