Patent ID: 7366485

Claim:
A multimode wireless transmitter comprising: a first oscillator that oscillates at a first predetermined frequency; a first frequency divider that frequency divides the frequency of the signal generated by the first oscillator, and outputs a first carrier foIa and a second carrier foQa with a 90 degree phase difference therebetween; a second oscillator that oscillates at a second predetermined frequency that is different from the first predetermined frequency generated by the first oscillator; a second frequency divider that frequency divides the frequency of the signal generated by the second oscillator; a third frequency divider that further divides the frequency of the output signal of the second frequency divider, and outputs a third carrier foIb and a fourth carrier foQb with a 90 degree phase difference therebetween; a first switching amplifier that receives the first carrier foIa and third carrier foIb, selects the first or third carrier based on a control signal applied thereto, and amplifies and outputs the selected carrier; a second switching amplifier that receives the second carrier foQa and fourth carrier foQb, selects the second or fourth carrier based on a control signal applied thereto, and amplifies and outputs the selected carrier; and an orthogonal modulator for orthogonally modulating the baseband signal by means of the output signals from the first and second switching amplifiers.