Patent ID: 7266485
Filing Date: 2007-09-04
Classification: G06F

Abstract:
1. A method of determining an equivalent circuit model of a passive element, said method comprising the steps of: (a) providing the equivalent circuit model using an RCL circuit comprising an RC circuit and an RL circuit connected in series to the RC circuit, the RC circuit comprising a resistor and a capacitor, the RL circuit comprising a resistor and an inductor; (b) inputting a measured impedance of the passive element over a frequency range (f (c) calculating an estimated impedance over the frequency range, the estimated impedance including an estimated real impedance R (d) determining first and second evaluation functions over respective first and second sub-frequency ranges within the frequency range, the first frequency sub-range including frequencies f the first evaluation function comprising: where the second evaluation function comprising: where and, for each of the first and the second evaluation functions, where 0≦x≦1, {right arrow over (P)}=(P (e) applying the estimated impedance calculated in step (c) and the measured impedance inputted in step (b) to the first and the second evaluation functions determined in step (d); (f) adjusting values of the estimated impedance to minimize the error between the estimated impedance and the measured impedance using the first evaluation function, thereby generating a part of element values of the equivalent circuit model of the passive element; (g) adjusting the values of the estimated impedance to minimize the error between the estimated impedance and the measured impedance using the second evaluation function, thereby generating a further part of the element values of the equivalent circuit model of the passive element; and (h) storing the part of the element values and the further part of the element values.