Patent ID: 8725085

Claim:
A front-end module (FEM) comprises: a first frequency band power amplifier (PA) configured to amplify a first frequency band outbound radio frequency (RF) signal; a second frequency band PA configured to amplify a second frequency band outbound RF signal; a first frequency band receiver-transmitter (RX-TX) isolation module configured to isolate a first frequency band inbound RF signal from the first frequency band outbound RF signal in accordance with a first frequency band isolation tuning signal; a second frequency band RX-TX isolation module configured to isolate a second frequency band inbound RF signal from the second frequency band outbound RF signal in accordance with a second frequency band isolation tuning signal; and an antenna interface unit operably tuned in accordance with an antenna interface tuning signal to: output at least one of the first frequency band outbound RF signal and the second frequency band outbound RF signal; and receive at least one of the first frequency band inbound RF signal and the second frequency band inbound RF signal, wherein each of the first and second RX-TX isolation modules comprises: a duplexer configured to: isolate the first frequency band inbound RF signal from the first frequency outbound RF signal; or isolate the second frequency band inbound RF signal from the second frequency outbound RF signal; a balance network configured to adjust impedance of the first or second RX-TX isolation module based on the first or second frequency band isolation tuning signal; and a common mode sensing circuit configured to generate a transmit leakage indication signal, wherein the first or second frequency band isolation tuning signal is generated based on the transmit leakage indication signal.