| 摘要 |
PROBLEM TO BE SOLVED: To correct a phase difference component while suppressing an arithmetic amount or a circuit amount to be small. SOLUTION: A demodulating device outputs a complex output signal having a common-mode correction component I' and an orthogonal correction component Q' based on a complex input signal having a common-mode component I and an orthogonal component Q. The device is provided with a phase difference detecting part 301 for detecting the phase difference component Δθ of the complex output signal and a phase correcting part for correcting the phase of the complex input signal based on the phase difference component. The part 301 obtains a common-mode estimation component based on the common- mode correction component I' obtains a common-mode component difference (d) by a linear operation at least based on the common-mode correction component I' and the common-mode estimation component and detects the largeness of the phase difference component Δθ based on the common-mode component difference (d). |
