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:
Mar. 04, 2014
Filed:
Feb. 13, 2009
Didier Belot, Rives, FR;
Alexandre Augusto Shirakawa, Talence, FR;
Eric Kerherve, Talence, FR;
Moustapha El Hassan, Talence, FR;
Yann Deval, Bordeaux, FR;
Didier Belot, Rives, FR;
Alexandre Augusto Shirakawa, Talence, FR;
Eric Kerherve, Talence, FR;
Moustapha El Hassan, Talence, FR;
Yann Deval, Bordeaux, FR;
STMicroelectronics S.A., Montrouge, FR;
Centre National de la Recherche Scientifique, Paris, FR;
Abstract
A filtering circuit with BAW type acoustic resonators having at least a first quadripole and a second quadripole connected in cascade, each quadripole having a branch series with a first acoustic resonator of type BAW and a branch parallel with each branch having an acoustic resonator of type BAW, the first acoustic resonator having a frequency of resonance series approximately equal to the frequency of parallel resonance of the second acoustic resonator, the branch parallel of the first quadripole having a first capacitance connected in series with the second resonator and, in parallel with the capacitance, a first switching transistor to short circuit the capacitance.