Radio frequency system with tunable notch filters
AssigneeSkyworks Solutions, Inc.
InventorsFei Jia, Joshua Kawika Ellis, Kun Chen, Shayan Farahvash, Haisu Ju, Haibo Cao
Life of this patent
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Abstract
Aspects of this disclosure relate to a radio frequency system with tunable notch filtering. The radio frequency system includes a first tunable filter and a second tunable filter. The first tunable filter is coupled between an output of a power amplifier and a radio frequency switch. The second tunable filter includes mutually coupled inductors and a tunable impedance circuit electrically connected to at least one of the mutually coupled inductors. The second tunable filter is coupled between an antenna switch and an antenna node. Related methods and wireless communication devices are also disclosed.
Claims20
A radio frequency system with tunable filtering, the radio frequency system comprising:
- a power amplifier having an output;
- a multi-throw switch;
- a first tunable filter coupled between the output of the power amplifier and the multi-throw switch, the first tunable filter having at least two tunable notches to provide notch filtering in a signal path between the output of the power amplifier and the multi-throw switch;
- an antenna switch coupled to the multi-throw switch by way of one or more radio frequency signal paths;
- and
- a second tunable filter coupled between the antenna switch and an antenna node, the second tunable filter having at least one tunable notch, the one tunable notch of the second tunable filter being associated with a harmonic of a radio frequency signal at the output of the power amplifier, and the two tunable notches of the first tunable filter each being at a higher respective frequency than the one tunable notch of the second tunable filter.
A wireless communication device with tunable filtering, the wireless communication device comprising:
- a power amplifier having an output;
- a multi-throw switch;
- a first tunable filter coupled between the output of the power amplifier and the multi-throw switch, the first tunable filter having at least two tunable notches to provide notch filtering in a signal path between the output of the power amplifier and the multi-throw switch;
- an antenna switch coupled to the multi-throw switch by way of one or more radio frequency signal paths;
- an antenna;
- and
- a second tunable filter coupled between the antenna switch and the antenna, the second tunable filter having at least one tunable notch, the one tunable notch of the second tunable filter being associated with a harmonic of a radio frequency signal at the output of the power amplifier, the two tunable notches of the first tunable filter each being at a higher respective frequency than the one tunable notch of the second tunable filter.
Dependencies are inferred from the claim text.