Patent ID: 7395087

Claim:
A radio receiver comprising: a receiving system for receiving a radio signal according to plural types of radio communication modes, each radio communication mode dealing with a radio signal having a different power-density spectrum, said receiving system comprising: plural types of amplifiers, each of which corresponds to one of said radio communication modes, each amplifier amplifying a received signal according to said corresponding radio communication mode, and having a transistor and a resistance connected to an emitter of the transistor, and each of the resistances has a different resistance value, a control unit which selects, based on a radio signal that has been actually received, a waiting mode corresponding to one of said plural types of radio communication modes, and uses an amplifier from said plural types of amplifiers, said amplifier corresponding to the selected waiting mode corresponding to said one of said plural types of radio communication modes, and a bias current controlling unit controlling a plurality of bias currents, each of the bias currents being provided for a corresponding amplifier when said control unit performs the selecting of the respective waiting mode, each of the bias currents being different from each other bias current due to a difference of the resistance values.