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 |
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.
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