US 12,003,263 B2
Radio frequency front end with tunable filters
Fei Jia, Calabasas, CA (US); Joshua Kawika Ellis, Cedar Rapids, IA (US); Kun Chen, Thousand Oaks, CA (US); Shayan Farahvash, Kensington, CA (US); Haisu Ju, Thousand Oaks, CA (US); and Haibo Cao, Newbury Park, CA (US)
Assigned to Skyworks Solutions, Inc., Irvine, CA (US)
Filed by Skyworks Solutions, Inc., Irvine, CA (US)
Filed on Aug. 24, 2021, as Appl. No. 17/410,902.
Claims priority of provisional application 63/072,522, filed on Aug. 31, 2020.
Claims priority of provisional application 63/072,594, filed on Aug. 31, 2020.
Prior Publication US 2022/0069786 A1, Mar. 3, 2022
Int. Cl. H04M 1/02 (2006.01); H03F 3/24 (2006.01); H03H 7/01 (2006.01); H04B 1/10 (2006.01)
CPC H04B 1/1036 (2013.01) [H03F 3/245 (2013.01); H03H 7/0115 (2013.01); H04M 1/0202 (2013.01); H03F 2200/171 (2013.01); H04B 2001/1063 (2013.01); H04B 2001/1072 (2013.01)] 20 Claims
OG exemplary drawing
 
1. 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, the second tunable filter being an L network that includes a parallel inductor-capacitor circuit and a shunt series inductor-capacitor circuit, and the parallel inductor-capacitor circuit arranged in series between the antenna switch and the antenna node.