BAW resonator filter bandwidth and out-of-band frequency rejection
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United States of America Patent
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Sep 3, 2013
Grant Date -
Mar 25, 2010
app pub date -
Nov 30, 2009
filing date -
Apr 11, 2007
priority date (Note) -
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Abstract
Embodiments of the present invention provide systems, devices and methods for improving both the bandwidth of a BAW resonator bandpass filter and the suppression of out-of-band frequencies above the passband. In various embodiments of the invention, blocker inductors are located in series between the filter input and the filter output to realize both bandwidth enhancement and improved out-of-band frequency rejection. For example, a first blocker inductor may be located at the input and a second blocker inductor may be located at the output of a BAW resonator bandpass filter.
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