Optimal antenna swap implementations in RF front end modules for TDD bands

1 . A front-end module comprising:

one or more receive ports configured to be coupled to a transceiver;

at least one low-noise amplifier configured to be coupled to the one or more receive ports;

a common filter coupled to a receive path and a transmit path of the front-end module;

one or more antenna ports configured to be coupled to one or more respective antennas; and

a multiplexer coupled to the one or more receive ports and to the one or more antenna ports, the multiplexer being configured to route a signal received at the one or more antenna ports to a selected receive port of the one or more receive ports through the common filter.

2 . The front-end module of claim 1 wherein the front-end module is configured to operate in one or more of a time-division duplexing mode of operation or a frequency-division duplexing mode of operation.

3 . The front-end module of claim 1 wherein the multiplexer is coupled to an output of the at least one low-noise amplifier.

4 . The front-end module of claim 1 wherein a number of receive ports of the one or more receive ports is greater than a number of low-noise amplifiers of the at least one low-noise amplifier.

5 . The front-end module of claim 4 wherein the at least one low-noise amplifier includes a plurality of low-noise amplifiers.

6 . The front-end module of claim 1 wherein the at least one low-noise amplifier includes a plurality of low-noise amplifiers, the front-end module further comprising a plurality of filters each corresponding to a respective low-noise amplifier of the plurality of low-noise amplifiers.

7 . The front-end module of claim 1 further comprising at least one remote-module receive port configured to be coupled to a remote module and configured to receive one or more signals from the remote module, wherein the multiplexer is further configured to route the one or more signals from the at least one remote-module receive port to the one or more receive ports coupled to the transceiver.

8 . The front-end module of claim 1 wherein the transmit path includes a power amplifier coupled to the common filter.

9 . The front-end module of claim 8 wherein the receive path includes the at least one low-noise amplifier coupled to the common filter.

10 . The front-end module of claim 9 further comprising a receive filter, wherein the at least one low-noise amplifier includes a first low-noise amplifier and a second low-noise amplifier, the first low-noise amplifier being coupled to the common filter and the second low-noise amplifier being coupled to the receive filter.

11 . The front-end module of claim 1 further comprising a first filter coupled to the transmit path and a second filter coupled to the receive path.

12 . The front-end module of claim 1 wherein at least one of the one or more receive ports is coupled to a remote module, and wherein the multiplexer is further configured to route one or more signals from the at least one receive port to the remote module.

13 . The front-end module of claim 12 further comprising the remote module, wherein the remote module is further configured to provide the one or more signals to the transceiver.

14 . A front-end module comprising:

one or more receive ports configured to be coupled to a transceiver;

at least one low-noise amplifier configured to be coupled to the one or more receive ports;

one or more antenna ports configured to be coupled to one or more respective antennas;

at least one remote-module receive port configured to be coupled to a remote module and configured to receive one or more signals from the remote module; and

a multiplexer coupled to the one or more receive ports and to the one or more antenna ports, the multiplexer being configured to

route a signal received at the one or more antenna ports to a selected receive port of the one or more receive ports, and

route the one or more signals from the at least one remote-module receive port to the one or more receive ports coupled to the transceiver.

15 . A method of operating an amplifier module having one or more receive ports, one or more antenna ports, an antenna switch module, a common filter coupled to a transmit path and a receive path, and a multiplexer, the method comprising:

receiving one or more receive signals at the one or more antenna ports;

routing, by the antenna switch module, the one or more receive signals to the multiplexer via the common filter and the receive path; and

routing, by the multiplexer, the one or more receive signals to a selected receive port of the one or more receive ports.

16 . The method of claim 15 wherein the amplifier module includes one or more transmit ports and a power amplifier, the method further comprising:

receiving one or more transmit signals at the one or more transmit ports;

providing the one or more transmit signals to the power amplifier; and

providing, by the power amplifier, the one or more transmit signals to the antenna switch module via the transmit path, the transmit path being different than the receive path.

17 . The method of claim 16 further comprising:

routing, by the antenna switch module, a first receive signal to the multiplexer via a first receive path; and

routing, by the antenna switch module, a second receive signal to the multiplexer via a second receive path, the first receive path and the second receive path being different than each other and the transmit path.

18 . The method of claim 15 further comprising:

receiving, at a first receive port of the one or more receive ports, a receive signal from a remote module; and

routing, by the multiplexer, the receive signal to a transceiver via a second receive port of the one or more receive ports.

19 . The method of claim 15 further comprising:

receiving a first receive signal at the one or more antenna ports;

routing, by the antenna switch module, the first receive signal to the multiplexer; and

routing, by the multiplexer, the first receive signal to a remote module via a selected receive port of the one or more receive ports.

20 . The method of claim 19 , further comprising:

receiving, by the remote module, the first receive signal; and

providing, by the remote module, the first receive signal to a transceiver.