| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a radio device which can have accurate DC off-set correction in a short period of time. <P>SOLUTION: A radio device comprises: a first correction part to correct the DC off-set of a first amplifier; a second correction part to correct the DC off-set of a second amplifier; a reference voltage source or a reference current source to supply to the first amplifier and the second amplifier a reference voltage or a reference current to refer to the DC off-set; a gain control part to maximize control an amplification gain of the first amplifier; a correction control part to maximize the amplification gain by controlling the gain control part, and to control the first and second correction parts so that the second correction part is corrected based on a second amplification signal obtained by inputting the reference voltage or the reference current in an input terminal of the second amplifier, and then the first correction part is corrected based on the second amplification signal obtained by inputting the reference voltage or the reference current in an input terminal of the first amplifier. <P>COPYRIGHT: (C)2012,JPO&INPIT |
