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:
May. 10, 2011
Filed:
Nov. 19, 2004
Kazuyuki Hori, Tokyo, JP;
Kazuyuki Hori, Tokyo, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
An object of this invention is to provide a method of designing a complex transfer function which can be realized in a passive RC complex filter at the same time while perfectly succeeding to features of a prototype lowpass characteristic. In this invention, as a first step, a prototype lowpass characteristic F(p) having a pole on a unit circle is designed. Next, as a second step, a bilinear variable transformation expressed by p=j(s−j)/(s+j) is performed with respect to the prototype characteristic F(p) to derive a complex coefficient transfer function G(s). As a third step, a passive RC complex filter H(s) is designed based upon the complex coefficient transfer function G(s).