Surface acoustic wave filter device
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United States of America Patent
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May 7, 2013
Grant Date -
Nov 15, 2012
app pub date -
Jul 26, 2012
filing date -
Jan 28, 2010
priority date (Note) -
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status (Latency Note)
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Abstract
A small-sized surface acoustic wave filter device having favorable filter characteristics includes a transmission-side surface acoustic wave filter chip including a ladder surface acoustic wave filter unit located on a piezoelectric substrate. The ladder surface acoustic wave filter unit includes a series arm connected between an input pad and an output pad and a plurality of resonators and including at least one first resonator connected to the input pad or the output pad. A die-attach surface is provided with an inductor connected to the first resonator. The inductor is arranged such that at least a portion thereof faces the first resonator and does not face any of the plurality of resonators and other than the first resonator.
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