Carrier aggregation front-end architecture

A front-end module configured to support carrier aggregation, the front-end module comprising:

• a primary signal path for processing a first frequency band, the first frequency band being a first time division duplex (TDD) frequency band;
• a secondary signal path for processing a second frequency band;
• the primary signal path including a first time division duplex filter module configured to process receive signals in the first frequency band and a second time division duplex filter module configured to process transmit signals in the first frequency band;
• the first time division duplex filter module and the second time division duplex filter module including one or more filters that have one or more corresponding initial filter stages that are identical, the one or more corresponding initial filter stages comprising a single resonator, a pair of parallel and series resonators, or a plurality of parallel and series resonators;
• an antenna switch module coupled to an antenna port and to at least the primary signal path and the secondary signal path;
• a low noise amplifier (LNA) module including one or more low noise amplifiers configured to amplify signals received at the antenna port via the first time division duplex filter module;
• and
• a power amplifier (PA) module including one or more power amplifiers configured to amplify signals received at a transceiver port for providing to the second time division duplex filter module.