US 11,722,163 B2
Radio frequency system with tunable filters including tunable filter with mutually coupled inductors
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. 17/410,931.
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 2022/0069854 A1, Mar. 3, 2022
This patent is subject to a terminal disclaimer.
Int. Cl. H04B 1/10 (2006.01); H03F 3/24 (2006.01); H03H 7/01 (2006.01); H04M 1/02 (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 radio frequency switch;
a first tunable filter coupled between the output of the power amplifier and the radio frequency switch;
an antenna switch coupled to the radio frequency switch by way of at least one radio frequency signal path; and
a second tunable filter coupled between the antenna switch and an antenna node, the second tunable filter including a first inductor, a second inductor mutually coupled to the first inductor, and a tunable impedance circuit coupled to the first inductor and including a switch, the first inductor associated with a tunable first notch, the second inductor associated with a second tunable notch, and the tunable impedance circuit configured to adjust a state of the switch such that locations of the first tunable notch and the second tunable notch are adjusted.