| CPC H03F 3/191 (2013.01) [H03F 3/195 (2013.01); H03F 3/245 (2013.01); H03F 3/26 (2013.01); H03F 3/3083 (2013.01); H04B 1/0458 (2013.01); H04B 1/40 (2013.01); H03F 2200/06 (2013.01); H03F 2200/09 (2013.01); H03F 2200/111 (2013.01); H03F 2200/451 (2013.01)] | 20 Claims |

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1. A mobile device comprising:
a transceiver configured to generate a first radio frequency signal of a first frequency band and a second radio frequency signal of a second frequency band; and
a front-end system including a push-pull power amplifier configured to selectively amplify one of the first radio frequency signal or the second radio frequency signal based on a band control signal, the push-pull power amplifier including an input balun, an output balun, and a pair of amplifiers coupled between the input balun and the output balun, the band control signal operable to control an input capacitance of the pair of amplifiers.
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