| 摘要 |
An offset errors of a quadrature modulator is corrected. A device including a first correction signal output unit (50) for outputting a first correction signal based upon a local signal (phase: 0°) from a 180°-phase amplifier (27) or a phase shift local signal (phase: 180°) from a 180°-phase amplifier (23), a second correction signal output unit (60) for outputting a second correction signal based upon an orthogonal local signal (phase: 90°) from a 180°-phase amplifier (37) or an orthogonal phase shift local signal (phase: 270°) from a 180°-phase amplifier (33), and a correction signal output unit (70) for outputting a correction signal based upon the first and second correction signals, wherein a correction signal is further added to outputs from an I signal mixer (42) and a Q signal mixer (44) by an adder (46) resulting in correcting offset errors of the quadrature modulation.
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