| 摘要 |
PROBLEM TO BE SOLVED: To provide an orthogonal demodulator that can calibrate an I (Q) signal conversion section without stopping the reception of the orthogonal demodulator. SOLUTION: The orthogonal demodulator is provided with an adder 32 that outputs a pseudo noise superimposing signal resulting from summing a user signal IF and a pseudo noise PN, a signal conversion section 100 that mixes the pseudo noise superimposing signal and a local signal L1 of a prescribed local frequency to provide an output of the conversion signal, a 1st multiplier 72 that multiplies the conversion signal with the pseudo noise to provide an output of a correlation signal, a 1st integrator 82 that integrates the correlation signal and provides an output of the integration, and a post-stage circuit 90 that applies desired processing to the conversion signal. Since the post-stage circuit 90 applies desired processing to the conversion signal while the 1st multiplier 72 extracts the pseudo noise and calibrates it, the signal conversion section 100 can be calibrated without stopping the reception of the orthogonal demodulator.
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