Patent ID: 8369250

Claim:
Radio frequency (RF) circuitry comprising: control circuitry adapted to select one of a plurality of operating modes, which comprise a first frequency division duplex (FDD) operating mode, a second FDD operating mode, and a time division duplex (TDD) operating mode; a first sub-band duplexer adapted to: during the TDD operating mode and during the second FDD operating mode, receive and filter a first transmit signal to provide a first filtered transmit signal, which falls within a first transmit passband of the first sub-band duplexer; and during the second FDD operating mode, receive and filter a first receive signal to provide a first filtered receive signal, which falls within a first receive passband of the first sub-band duplexer; and a second sub-band duplexer adapted to: during the first FDD operating mode, receive and filter a second transmit signal to provide a second filtered transmit signal, which falls within a second transmit passband of the second sub-band duplexer, such that a combination of the first transmit passband and the second transmit passband span an FDD transmit band, and during the TDD operating mode while transmitting, the first transmit passband spans a TDD band; and during the first FDD operating mode and during the TDD operating mode, receive and filter a second receive signal to provide a second filtered receive signal, which falls within a second receive passband of the second sub-band duplexer, such that a combination of the first receive passband and the second receive passband span an FDD receive band, and during the TDD operating mode while receiving, the second receive passband spans the TDD band, which falls between the FDD transmit band and the FDD receive band.