Centre National De La Recherche Scientifique

Stmicroelectronics S.a.

Moustapha El Hassan

Didier Belot

Eric Kerherve

Yann Deval

Alexandre Shirakawa

Alexandre Augusto Shirakawa

Andréia Cathelin

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.

Bulk acoustic wave resonator filter being digitally reconfigurable, with process

A bulk acoustic wave resonator has an adjustable resonance frequency. A piezoelectric element is provided having first and second electrodes. A switching element is provided in the form of a MEMS structure which is deformable between a first and second position. The switching element forms an additional electrode that is selectively disposed on top of, and in contact with, one of the first and second electrodes. This causes a total thickness of the electrode of the resonator to be changed resulting in a modification of the resonance frequency of the resonator.

Bulk acoustic wave resonator with adjustable resonance frequency and use of such a resonator in the field of telephony

Growing community of inventors

Talence, France

Moustapha El Hassan