Apparatus and method for detecting a target environmental variable that employs film-bulk acoustic wave resonator oscillators
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United States of America Patent
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Apr 15, 2008
Grant Date -
Oct 19, 2006
app pub date -
Apr 18, 2005
filing date -
Apr 18, 2005
priority date (Note) -
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Abstract
An apparatus and method for detecting a target environmental variable (TEV). A first film-bulk acoustic resonator (FBAR) oscillator that includes a first FBAR with a first response to the target environmental variable generates a first frequency. A second film-bulk acoustic resonator (FBAR) oscillator that includes a second FBAR with a second response to the target environmental variable generates a second frequency. A circuit that is coupled to the first FBAR oscillator and the second FBAR oscillator determines the target environmental variable (e.g., changes in the TEV) based on the first frequency and the second frequency.
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