CA FDD-FDD and FDD-TDD architecture

Radio frequency (RF) front end circuitry comprising:

• a plurality of antenna nodes;
• antenna switching circuitry coupled to the plurality of antenna nodes;
• a plurality of input/output nodes;
• transceiver circuitry coupled to the plurality of input/output nodes;
• and
• RF filtering circuitry coupled between the antenna switching circuitry and the plurality of input/output nodes, the RF filtering circuitry comprising:
• first multiplexer circuitry including a first plurality of filters configured to pass primary RF transmit signals within one or more frequency division duplexing (FDD) operating bands, primary RF receive signals within the one or more FDD operating bands, and diversity multiple-input-multiple-output (MIMO) receive signals within one or more time division duplexing (TDD) operating bands between the antenna switching circuitry and different ones of the plurality of input/output nodes while attenuating other signals;
• and
• second multiplexer circuitry including a second plurality of filters configured to pass primary RF transmit signals within the one or more TDD operating bands, primary RF receive signals within the one or more TDD operating bands, and diversity MIMO receive signals within the one or more FDD operating bands between the antenna switching circuitry and different ones of the plurality of input/output nodes while attenuating other signals;
• and
• at least one transmit/receive switch coupled between one of the second plurality of filters and the transceiver circuitry and configured to selectively couple the one of the second plurality of filters to one of a transmit signal path and a receive signal path in the transceiver circuitry such that the primary RF transmit signals within the one or more TDD operating bands are provided to the transmit signal path and the primary RF receive signals within the one or more TDD operating bands are provided to the receive signal path.