PROBLEM TO BE SOLVED: To provide a voltage/current conversion gain controller capable of varying a voltage/current conversion gain with high accuracy or in a wide range, to provide a voltage/current conversion gain control method, and to provide a radio device adopting the voltage/current conversion gain controller.;SOLUTION: In the voltage/current conversion gain controller 100, a plurality of variable capacitor type voltage/current converting sections 11 to 14 (called as "voltage/current converting section 1n") are connected in parallel, wherein the maximum voltage/current conversion gain is set to a predetermined scale factor. The voltage/current conversion gains of respective voltage/current converting sections 1n are independently controlled in accordance with clocks CK21 to 24 each supplied to the voltage/current converting sections 1n. Then, in the voltage/current conversion gain controller 100, the independently controlled voltage/current converting sections 1n respectively set a voltage/current conversion gain, and a voltage/current conversion gain combined from values obtained by adding the respective voltage/current conversion gains can be controlled.;COPYRIGHT: (C)2011,JPO&INPIT
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