US 11,909,428 B2
Tunable filter with harmonic rejection
Kun Chen, Thousand Oaks, CA (US); Joshua Kawika Ellis, Cedar Rapids, IA (US); Shayan Farahvash, Kensington, 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 Jun. 18, 2021, as Appl. No. 17/351,984.
Claims priority of provisional application 63/071,261, filed on Aug. 27, 2020.
Claims priority of provisional application 63/046,184, filed on Jun. 30, 2020.
Prior Publication US 2021/0409047 A1, Dec. 30, 2021
Int. Cl. H04B 1/10 (2006.01); H03H 7/01 (2006.01)
CPC H04B 1/10 (2013.01) [H03H 7/0115 (2013.01); H03H 7/0153 (2013.01); H04B 1/1027 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A tunable filter with harmonic rejection, the tunable filter comprising:
a first inductor;
a second inductor mutually coupled with the first inductor; and
a tunable capacitance circuit electrically connected to the first inductor, the tunable capacitance circuit including N switches configured to adjust effective capacitance of the tunable capacitance circuit to tune harmonic rejection of the tunable filter for at least 2×2N harmonics, N being a positive integer greater than 1, and the tunable filter being arranged to filter a radio frequency signal.