Patent ID: 7489910
Filing Date: 2009-02-10
Classification: H03F,H04B

Abstract:
1. A wireless transmitter comprising: a first modulation unit configured to modulate first input signal to first modulated signal; a second modulation unit configured to modulate second input signal to second modulated signal; a first amplifier configured to amplify the first modulated signal and output first amplified signal; a second amplifier configured to amplify the second modulated signal and output second amplified signal; a first antenna configured to radiate first amplified signal; a second antenna configured to radiate second amplified signal; a first path which conducts the first modulated signal to the first amplifier and conducts the second modulated signal to the second amplifier; a second path which divides the first modulated signal to conduct first divided signal to the first amplifier and second divided signal to the second amplifier; a first path changeover unit which conducts the first modulated signal and second modulated signal, to the first path or the second path selectively; a third path which conducts the first amplified signal to the first antenna, and conducts the second amplified signal to the second antenna; a fourth path which generates combined signal which is sum of the first amplified signal and the second amplified signal at a combining point, and conducts the combined signal to the first or second antenna; an impedance conversion unit which converts impedance between the first amplifier and the combining point; a second path changeover unit which conducts the first amplified signal and second amplified signal, to the third path or the fourth path selectively; and a control unit configured to set the first path changeover unit to conduct the first modulated signal and second modulated signal to the first path at the time to set the second path changeover unit to conduct the first amplified signal and second amplified signal to the third path, and configured to set the first path changeover unit to conduct the first modulated signal and second modulated signal to the second path at the time to set the second path changeover unit to conduct the first amplified signal and second amplified signal to the fourth path.