Radio communication system having current control circuit

A radio communication system including a high-frequency amplifier circuit and a frequency converter circuit connected to said high-frequency amplifier circuit, said radio communication system comprising:

• a first current control circuit for applying a first predetermined bias voltage to a first transistor of said high-frequency amplifier circuit, the first transistor having a first terminal for an input, a second terminal coupled to a reference potential and a third terminal coupled to an output of the high-frequency amplifier circuit, the first predetermined bias voltage being applied to only the first terminal of the first transistor;
• a second current control circuit for applying a second predetermined bias voltage to a second transistor of said frequency converter circuit, the second transistor having a first terminal for an input, a second terminal coupled to a reference potential and a third terminal coupled to an output of the frequency converter circuit, the second predetermined bias voltage being applied to only the first terminal of the second transistor;
• and
• a control circuit for supplying a control voltage to said first and second current control circuits which is added to said first and second bias voltages, respectively, the control voltage adding to the first predetermined bias voltage for reducing a current of the first terminal of the first transistor for a low amplification factor of the first transistor and for increasing the current of the first terminal of the first transistor for a high amplification factor of the first transistor, and adding to the second predetermined bias voltage for reducing a current of the first terminal of the second transistor for a low amplification factor of the second transistor and for increasing the current of the first terminal of the second transistor for a high amplification factor of the second transistor.