Patent ID: 7542740
Filing Date: 2009-06-02
Classification: H04B,H04W

Abstract:
1. A front end module, comprising: a balanced power amplifier comprising a first amplifier chain and a second amplifier chain adapted to amplify first and second signals to provide amplified first and second signals, wherein a phase of the first signal leads a phase of the second signal in a first mode and the phase of the first signal lags the phase of the second signal in a second mode; a combiner comprising a first output port and a second output port, said combiner adapted to combine the amplified first and second signals into a combined signal and provide the combined signal at the first output port or the second output port depending on whether the phase of the amplified first signal leads the phase of the amplified second signal; and a switch connected to the first output port, said switch providing attenuation thereacross when the combined signal is provided at the second output port, wherein the attenuation is supplemented by attenuation between the first and second output ports of the combiner.