Acoustic filters providing negative capacitance for use in multiplexers
AssigneeQorvo US, Inc.
InventorNadim Khlat
Life of this patent
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Abstract
An acoustic filter providing negative capacitance for use in multiplexers is provided that may include a first resonator and a second resonator. The second resonator may be a three terminal element that includes two sub-resonator elements having opposite polarities that are mechanically coupled such that as one sub-resonator expands, the other contracts. The second resonator may act as a negative capacitance element relative to the first resonator such that the second resonator provides cancelation at specific frequencies. This structure may further reduce the order of an N-multiplexer ladder network and reduce total insertion loss.
Claims13
1-8. (canceled)
A multiplexer comprising:
- an input;
- a first acoustic filter comprising:
- a first resonator element comprising:
- a first terminal electrically coupled to the input;
- and
- a second terminal;
- and
- a second resonator element comprising:
- a first sub-resonator element having a first polarity, the first sub-resonator element having a seventh terminal electrically coupled to the first terminal;
- and
- a second sub-resonator element having a second polarity opposite the first polarity, the second sub-resonator element mechanically coupled to the first sub-resonator with a third terminal therebetween;
- and
- a second acoustic filter comprising:
- a third resonator element comprising:
- a fourth terminal electrically coupled to the input;
- and
- a fifth terminal;
- and
- a fourth resonator element comprising
- a third sub-resonator element having the first polarity, the third sub-resonator element having an eighth terminal electrically coupled to the fourth terminal;
- and
- a fourth sub-resonator element having the second polarity, the fourth sub-resonator element mechanically coupled to the third sub-resonator with a sixth terminal therebetween;
- wherein the fourth sub-resonator element is electrically coupled to the second terminal through a ninth terminal and the second sub-resonator element is electrically coupled to the fifth terminal through a tenth terminal.
Dependencies are inferred from the claim text.