Patent ID: 8731490

Claim:
Circuitry comprising: a first power amplifier (PA) configured to operate in one of an ON state, in which the first PA amplifies one or more signals about a first frequency band, or an OFF state; a first filter coupled to the first PA and configured to pass signals about the first frequency band between an output of the first PA and a first antenna node; a second power amplifier (PA) configured to operate in one of an ON state, in which the second PA amplifies one or more signals about a second frequency band that is different from the first frequency band, or an OFF state; a second filter coupled to the second PA and configured to, in the ON state of the first PA, exhibit a first frequency response in order to attenuate signals about one or more harmonic frequencies of the first frequency band, and in the OFF state of the first PA, exhibit a second frequency response in order to pass signals about the second frequency band between an output of the second PA and a second antenna node.