| 摘要 |
PROBLEM TO BE SOLVED: To reduce dispersion in modulation accuracy by suppressing an upper side wave band component or the like in an output so as to obtain a stable modulation output signal and to improve the yield of ICs, when integrating the circuit of an orthogonal modulator, by reducing the effect of dispersion in components of a base band section and a phase shift circuit. SOLUTION: An orthogonal modulation circuit 10 is provided with a 1st multiplier circuit 11, that is used to apply frequency conversion to 1st and 2nd carrier signals with 1st and 2nd modulation signals, a 2nd multiplier circuit 12, that is used to apply frequency conversion to 3rd and 4th carrier signals with 3rd and 4th modulation signals, and an adder circuit 13, that sums outputs of the 1st and 2nd multipliers 11, 12, and also with a detection circuit 16, that detects an undesired frequency component of a modulation output signal of the adder circuit 13, a 1st delay circuit 14 that receives a 1st control signal outputted from the detection circuit 16 to adjust phases of the 1st and 2nd modulation signals, and a 2nd delay circuit 15, that receives a 2nd controls signal outputted from the detection circuit 16 to adjust phases of the 3rd and 4th modulation signals.
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