Patent ID: 7925227
Filing Date: 2011-04-12
Classification: H04B

Abstract:
1. An amplifier circuit, comprising: a first power amplifier configured to produce a first amplified signal in response to a first input signal in a first frequency band, wherein the output of the first power amplifier is not coupled to a trap circuit; a second power amplifier configured to produce a second amplified signal in response to a second input signal in a second frequency band, wherein a center frequency of the second frequency band is higher than the center frequency of the first frequency band; a control circuit configured to turn on or turn off the first power amplifier and configured to turn on or turn off the second power amplifier; and a shunting circuit coupled to an output of the second power amplifier, wherein the shunting circuit comprises a shunting switch that is configured to bypass harmonic signals from the first frequency band to the ground under the control of the control circuit.