US 11,973,523 B2
Radio frequency front end module including common filter
Joel Richard King, Newbury Park, CA (US); Tianming Chen, Newbury Park, CA (US); Shayan Farahvash, Kensington, CA (US); Stephane Richard Marie Wloczysiak, Irvine, CA (US); Anand Raghavan, Middleton, WI (US); and David Richard Pehlke, Westlake Village, CA (US)
Assigned to Skyworks Solutions, Inc., Irvine, CA (US)
Filed by Skyworks Solutions, Inc., Irvine, CA (US)
Filed on Dec. 2, 2021, as Appl. No. 17/457,385.
Claims priority of provisional application 63/122,226, filed on Dec. 7, 2020.
Claims priority of provisional application 63/122,145, filed on Dec. 7, 2020.
Prior Publication US 2022/0182084 A1, Jun. 9, 2022
This patent is subject to a terminal disclaimer.
Int. Cl. H04B 1/04 (2006.01); H04B 1/12 (2006.01)
CPC H04B 1/04 (2013.01) [H04B 1/126 (2013.01); H04B 2001/0408 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A radio frequency front end system comprising:
at least one power amplifier configured to amplify a transmit radio frequency signal within a first frequency range;
at least one low noise amplifier configured to receive a receive radio frequency signal within a second frequency range different from the first frequency range;
an output node coupled to an antenna;
at least one switch configured to selectively couple the output node to the at least one power amplifier during a transmit period and to the at least one low noise amplifier during a receive period;
at least one transmit filter coupled between the power amplifier and the at least one switch;
at least one receive filter coupled between the low noise amplifier and the at least one switch; and
a common filter coupled between the at least one switch and the output node, the common filter including one or more components configured to filter one or more frequencies that are commonly filtered for the first frequency range and the second frequency range, the common filter together with the at least one transmit filter configured to band-pass the first frequency range, and the common filter together with the at least one receive filter configured to band-pass the second frequency range.