Radio frequency front end with tunable 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 is coupled between an antenna switch and an antenna node. The second tunable filter has a notch at a lower frequency than a notch of the first tunable filter. Related methods and wireless communication devices are also disclosed.
Claims20
A radio frequency system with tunable notch 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 a first tunable notch;
- 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 a second tunable notch, the second tunable notch being at a lower frequency than the first tunable notch.
A method of filtering radio frequency signals with tunable notch filtering, the method comprising:
- filtering an output signal from a power amplifier with a first tunable filter in a first state, the first tunable filter coupled between an output of the power amplifier and a multi-throw switch;
- processing an output signal from the first tunable filter with a signal path coupled between the multi-throw switch and an antenna switch;
- filtering an output signal from the antenna switch with a second tunable filter, the second tunable filter having a second tunable notch at a lower frequency than a first tunable notch of the first tunable filter;
- adjusting a state of the first tunable filter from the first state to a second state to thereby change a location of the first tunable notch in the frequency domain;
- and
- filtering the output signal from the power amplifier with the first tunable filter in the second state.
A wireless communication device with tunable notch 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 a first tunable notch;
- 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 a second tunable notch, the second tunable notch being at a lower frequency than the first tunable notch.
Dependencies are inferred from the claim text.