Patent ID: 7127268

Claim:
A radio transmitter comprising: a digital signal processing section which outputs a base band signal for a first or second radio communication system; a frequency synthesizer which outputs a local oscillator signal for said first or second radio communication system; a quadrature modulator which generates a modulated signal based on said base band signal and said local oscillator signal; a first output terminal which outputs a transmission signal for said first radio communication system; a second output terminal which outputs a transmission signal for said second radio communication system; a first transmission processing section which is disposed between said quadrature modulator and said first output terminal, corresponds to said first radio communication system, and conducts a frequency conversion of said modulated signal to apply the frequency-converted signal to said first output terminal; a second transmission processing section which is disposed between said quadrature modulator and said second output terminal, corresponds to said second radio communication system, and applies said modulated signal to said second output terminal without conducting the frequency conversion; and a first switch section which changes whether or not to supply an output signal of said quadrature modulator to said first or second transmission processing section.