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

(canceled)

A bulk acoustic wave resonator, comprising:

• a resonator structure including first and second electrodes;
• and
• a bistable MEMS structure which moves between a first position not in contact with one of the first and second electrodes and associated with a first resonant frequency of the resonator structure and a second position which is in contact with one of the first and second electrodes and associated with a second, different resonant frequency of the resonator structure.

A bulk acoustic wave resonator, comprising:

• a resonator structure including first and second electrodes, the resonator selectively operating at a first resonant frequency and a second resonant frequency;
• and
• a MEMS structure over the resonator structure which moves between a first position not in contact with one of the first and second electrodes to select the first resonant frequency and a second position which is in contact with one of the first and second electrodes to select the second, different, resonant frequency.