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US 12,431,868 B2Granted
Multi-mode surface acoustic wave filter with impedance conversion
AssigneeSkyworks Solutions, Inc.
InventorsTomoya Komatsu, Yiliu Wang
Life of this patent
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Abstract
Aspects of this disclosure relate to an acoustic wave filter that includes a multi-mode surface acoustic wave filter and a ladder section. The multi-mode surface acoustic wave filter has a higher impedance at an output than at an input. The ladder section is connected to the output of the multi-mode surface acoustic wave filter. Related radio frequency systems, radio frequency modules, wireless communication devices, and methods are disclosed.
Claims20
An acoustic wave filter comprising:
- a multi-mode surface acoustic wave filter including an input that is single-ended and an output that is single-ended, the input including at least one more track than the output, and the multi-mode surface acoustic wave filter having a higher impedance at the output than at the input;
- a ladder section connected to the output of the multi-mode surface acoustic wave filter, the ladder section including at least one shunt acoustic wave resonator and at least one series acoustic wave resonator;
- and
- a shunt inductor, the ladder section coupled between the multi-mode surface acoustic wave filter and the shunt inductor, and the acoustic wave filter configured to filter a radio frequency signal.
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An acoustic wave filter comprising:
- a multi-mode surface acoustic wave filter including an input that is single-ended and an output that is single-ended, the input including at least one more track than the output, and the multi-mode surface acoustic wave filter having a higher impedance at the output than at the input;
- a ladder section connected to the output of the multi-mode surface acoustic wave filter, the ladder section including at least one shunt acoustic wave resonator and at least one series acoustic wave resonator;
- and
- a shunt inductor, the ladder section coupled between the multi-mode surface acoustic wave filter and the shunt inductor, the acoustic wave filter configured to filter a radio frequency signal, and the acoustic wave filter is configured as a transmit filter.
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A radio frequency system comprising:
- a low noise amplifier;
- and
- an acoustic wave filter including a multi-mode surface acoustic wave filter, a shunt inductor, and a ladder section coupled between the multi-mode surface acoustic wave filter and the shunt inductor;
- the ladder section being in a signal path between the multi-mode surface acoustic wave filter and an input of the low noise amplifier, the multi-mode surface acoustic wave filter including an input and an output, the input of the multi-mode surface acoustic wave filter having at least one more track than the output of the multi-mode surface acoustic wave filter, and the multi-mode surface acoustic wave filter having a higher impedance at the output than at the input.
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Dependencies are inferred from the claim text.