| 摘要 |
PROBLEM TO BE SOLVED: To provide a DC offset calibration system capable of eliminating the need for a means for storing a static DC offset by attaining correction of a dynamic DC offset independently of the magnitude of the static DC offset. SOLUTION: The DC offset calibration system includes: a means for correcting the dynamic DC offset caused by quadratic nonlinear distortion of a mixer 2 to the input terminal of which a disturbing wave is given; and a means for correcting the static DC offset caused by self-mixing with a leakage component of a local signal appearing at the input terminal of the mixer, and the DC offset calibration system starts correction of the static DC offset 1201 at a first time t1, completes the correction of the static DC offset 1201 at a second time t2, and thereafter starts the correction of the dynamic DC offset 1003, and completes the correction of the dynamic DC offset 1003 at a third time t3 to correct the dynamic DC offset 1003. COPYRIGHT: (C)2006,JPO&NCIPI
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