| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a phase adjusting circuit to adjust a phase difference between an I signal and a Q signal so as to become equal in all frequency ranges, a disturbance signal removing circuit provided with the phase adjusting circuit, and a radio receiver provided with the disturbance signal removing circuit. <P>SOLUTION: The I signal and the Q signal input from an input terminal T1 and an input terminal T2, respectively, are added by an adder 21 and are attenuated to 1/X times by an attenuator 22. The attenuated signal is added to the I signal by an adder 23 and is output from an output terminal T3. The attenuated signal is added to the Q signal by an adder 24 and is output from an output terminal T4. The phase difference between the I signal and the Q signal is reduced by this operation. As an in-phase component whose phase has delayed is used for a phase adjustment, the phases of the I signal and the Q signal are changed keeping the phase difference between the I signal and the Q signal at a low-frequency component side and the phase difference between the I signal and the Q signal at a high-frequency component side almost equal. <P>COPYRIGHT: (C)2008,JPO&INPIT |
