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:
Jul. 23, 2002
Filed:
May. 26, 2000
Oki Electric Industry Co., Ltd., Tokyo, JP;
Abstract
In a differential surface acoustic wave resonator, when an unbalanced electric signal is inputted between an input terminal and an output terminal connected to a ground potential, this electric signal is inputted to two-terminal-pair surface acoustic wave resonators and . The electric signal inputted to the two-terminal-pair surface acoustic wave resonator is converted into a surface acoustic wave, and thereafter it is again converted into an electric signal to be outputted to a two-terminal-pair surface acoustic wave resonator . The electric signal inputted to the two-terminal-pair surface acoustic wave resonator is converted into a surface acoustic wave, and thereafter it is again converted into an electric signal to be outputted from an output terminal of the differential surface acoustic wave filter as a balanced signal. On the other hand, the electric signal inputted to the two-terminal-pair surface acoustic wave resonator is converted into a surface acoustic wave, and thereafter it is again converted into an electric signal to be outputted to a two-terminal-pair surface acoustic wave resonator . The electric signal inputted to the two-terminal-pair surface acoustic wave resonator is converted into a surface acoustic wave, and thereafter it is again converted into an electric signal to be outputted from an output terminal of the differential surface acoustic wave filter as a balanced signal. Here, in the respective two-terminal-pair surface acoustic wave resonators to , the phase of the electric signal to be inputted is substantially ° different from that of the electric signal to be outputted. The balanced signals having the same phase and the same amplitude are outputted from the two output terminals of the differential surface acoustic wave filter.