PROBLEM TO BE SOLVED: To provide circuits and methods related to radio-frequency (RF) architectures having carrier aggregation.SOLUTION: In some implementations, a carrier aggregation (CA) architecture can include a duplexer configured to provide duplexing functionality for a first frequency band and a second frequency band with a common antenna. The CA architecture can further include a first amplification path and a second amplification path coupled to respective ports of the duplexer. The first and second amplification paths are configured to amplify signals in their respective frequency bands. Each amplification path includes a transmit/receive (TX/RX) switch configured to provide time-division duplexing (TDD) functionality for amplified signals and received signals. In some implementations, the first frequency band includes a B39 band, and the second frequency band includes a B41 band.SELECTED DRAWING: Figure 3
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