US 11,916,577 B2
Systems and methods for duplexer circuits having signal cancellation paths
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 Mar. 31, 2022, as Appl. No. 17/657,584.
Claims priority of provisional application 63/171,809, filed on Apr. 7, 2021.
Claims priority of provisional application 63/171,803, filed on Apr. 7, 2021.
Claims priority of provisional application 63/171,811, filed on Apr. 7, 2021.
Prior Publication US 2022/0329273 A1, Oct. 13, 2022
Int. Cl. H04B 1/00 (2006.01); H04B 1/525 (2015.01); H03H 7/46 (2006.01); H04B 1/18 (2006.01); H04B 1/44 (2006.01); H04B 1/16 (2006.01); H04B 1/3805 (2015.01); H04B 1/04 (2006.01); H04B 1/10 (2006.01); H04B 1/12 (2006.01)
CPC H04B 1/0057 (2013.01) [H03H 7/463 (2013.01); H04B 1/0483 (2013.01); H04B 1/1081 (2013.01); H04B 1/12 (2013.01); H04B 1/1607 (2013.01); H04B 1/18 (2013.01); H04B 1/3805 (2013.01); H04B 1/44 (2013.01); H04B 1/525 (2013.01); H04B 2001/0408 (2013.01); H04B 2001/3811 (2013.01)] 21 Claims
OG exemplary drawing
 
1. A duplexer circuit comprising:
a first transmit filter configured to receive a radio frequency transmit signal from a power amplifier, and a first receive filter configured to receive, via the first transmit filter, a leakage signal caused by the radio frequency transmit signal;
a first low-noise amplifier configured to receive the leakage signal from the first receive filter and amplify the leakage signal;
a cancellation path configured to receive the radio frequency transmit signal from the power amplifier;
a second low-noise amplifier configured to receive a cancellation signal caused by the radio frequency transmit signal travelling through the cancellation path; and
a phase shifter configured to apply a phase shift to one or both of the leakage signal and the cancellation signal.