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US 12,549,156 B2Granted
Receive filter with bulk acoustic wave resonators
AssigneeSkyworks Solutions, Inc.
InventorShihan Qin
Life of this patent
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Abstract
A radio frequency ladder filter comprises a plurality of series bulk acoustic wave (BAW) resonators electrically connected in series between an input and an output, at least one BAW resonator connected between a node between adjacent ones of the plurality of series BAW resonators and ground, at least one shunt resonator element including an inductor and a capacitor in series and electrically coupled to ground between the input and a first of the plurality of series resonators, and at least one last shunt resonator element including an inductor and a capacitor in series and electrically coupled to ground between the output and a last of the plurality of series resonators.
Claims20
A radio frequency ladder filter comprising:
- a plurality of series bulk acoustic wave (BAW) resonators electrically connected in series between an input and an output;
- at least one shunt BAW resonator connected between a node between adjacent ones of the plurality of series BAW resonators and ground;
- at least one shunt resonator element including an inductor and a capacitor in series and electrically coupled to ground between the input and a first of the plurality of series BAW resonators, the first of the plurality of series BAW resonators being closest to the input among all of the plurality of series BAW resonators;
- a first additional BAW resonator electrically connected in parallel with the at least one shunt resonator element and coupled to ground between the input and the first of the plurality of series BAW resonators;
- at least one last shunt resonator element including an inductor and a capacitor in series and electrically coupled to ground between the output and a last of the plurality of series BAW resonators, the last of the plurality of series BAW resonators being closest to the output among all of the plurality of series BAW resonators;
- and
- a second additional BAW resonator electrically connected in parallel with the at least one last shunt resonator element and electrically coupled to ground between the output and the last of the plurality of series BAW resonators.
4 more elements
A radio frequency device including a radio frequency device module having a radio frequency ladder filter comprising:
- a plurality of series bulk acoustic wave (BAW) resonators electrically connected in series between an input and an output;
- at least one shunt BAW resonator connected between a node between adjacent ones of the plurality of series BAW resonators and ground;
- at least one shunt resonator element including an inductor and a capacitor in series and electrically coupled to ground between the input and a first of the plurality of series BAW resonators, the first of the plurality of series BAW resonators being closest to the input among all of the plurality of series BAW resonators;
- a first additional BAW resonator electrically connected in parallel with the at least one shunt resonator element and coupled to ground between the input and the first of the plurality of series BAW resonators;
- at least one last shunt resonator element including an inductor and a capacitor in series and electrically coupled to ground between the output and a last of the plurality of series BAW resonators, the last of the plurality of series BAW resonators being closest to the output among all of the plurality of series BAW resonators;
- and
- a second additional BAW resonator electrically connected in parallel with the at least one last shunt resonator element and electrically coupled to ground between the output and the last of the plurality of series BAW resonators.
4 more elements
A method of forming a radio frequency ladder filter, the method comprising:
- forming a plurality of series bulk acoustic wave (BAW) resonators electrically connected in series between an input and an output;
- forming at least one BAW resonator connected between a node between adjacent ones of the plurality of series BAW resonators and ground;
- forming at least one shunt resonator element including an inductor and a capacitor in series and electrically coupled to ground between the input and a first of the plurality of series BAW resonators, the first of the plurality of series BAW resonators being closest to the input among all of the plurality of series BAW resonators;
- forming a first additional BAW resonator electrically connected in parallel with the at least one shunt resonator element and coupled to ground between the input and the first of the plurality of series BAW resonators;
- forming at least one last shunt resonator element including an inductor and a capacitor in series and electrically coupled to ground between the output and a last of the plurality of series BAW resonators, the last of the plurality of series BAW resonators being closest to the output among all of the plurality of series BAW resonators;
- and
- forming a second additional BAW resonator electrically connected in parallel with the at least one last shunt resonator element and electrically coupled to ground between the output and the last of the plurality of series BAW resonators.
4 more elements
Dependencies are inferred from the claim text.