The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 13, 2009
Filed:
Jan. 29, 2007
Yu-li Su, Taipei, TW;
Chun-yu Lai, Taipei, TW;
Yu-Li Su, Taipei, TW;
Chun-Yu Lai, Taipei, TW;
Inventec Corporation, Taipei, TW;
Abstract
A calibration method of insulating washer in a circuit board is provided, which includes steps of (a) establishing an equivalent circuit model corresponding to a metal via; (b) depicting an electric characteristic curve corresponding to the model; (c) calculating a capacitance and an inductance equation corresponding to the curve; (d) substituting parameter values of the equivalent circuit model, capacitance equation, and inductance equation into a characteristic impedance expression for being calculated, so as to obtain a first radius length value of an insulating washer for the metal via; (e) making a temporary insulating washer by employing the value; (f) reestablishing an equivalent circuit model corresponding to the metal via according to the temporary insulating washer; repeating Steps (b), (c), (d), (e), and (f); and when the first radius length value is converged into a fixed value, determining the fixed value as an optimum value for designing the insulating washer.