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:
Jan. 23, 2001
Filed:
Dec. 23, 1999
Susumu Yoshimoto, Tokyo, JP;
NEC Corporation, Tokyo, JP;
Abstract
A surface acoustic wave device and method of connecting surface acoustic wave filters are provided in which the relative out-of-band attenuation is increased to prevent the propagation of electrical feedthrough from the input of a first stage to the output of the second stage of a device. In a multistage connection configuration of transversely coupled mode resonator-type surface acoustic wave (SAW) filters, electrically balanced signals are applied to the two inputs of the first-stage filter, the portion between stages that joins the first-stage filter and the second-stage filter is an electrically unbalanced connection, and one of the connections between the two outputs of the first stage and the two inputs of the second stage is connected to ground potential. Subsequently, the two outputs of the second stage again become electrically balanced signal output.