| 摘要 |
<p>It is possible to suppress distortion of output of a mixer. A modulator (1) includes a local signal source (10) for generating an in-phase local signal, a multiplier (12) for multiplying an in-phase baseband signal (I) by the in-phase local signal, a phase reverser (142) for reversing the phase upon reception of the in-phase local signal from the local signal source (10), a reverse-phase multiplier (144) for multiplying a reverse-phase band signal-I (equivalent to a signal obtained by reversing the phase of the in-phase base band signal I) by an output of the phase reverser (142) (reverse-phase local signal), and an adder (16) for adding the output of the multiplier (12) and the output of the reverse multiplier (144). A leak component (carrier leak) obtained by leak of the in-phase local signal from the multiplier (12) becomes 0 when the signal obtained by leak of the output of the phase reverser (142) from the reverse-phase multiplier (144) is added by the adder (16). That is, the leak component outputted from the multiplier (12) is cancelled.</p> |
