| 摘要 |
<p>The fundamental waves and 3rd harmonics waves of two local signals output from a 90° phase shifter (2) are suppressed by use of low-pass filters (3a, 3b). The local signals in which the fundamental waves and 3rd harmonics waves are suppressed are respectively supplied to two multipliers (4a, 4b) and respectively multiplied by Ich and Qch base band signals. The results of multiplication in the two multipliers (4a, 4b) are added together in an adder (5) to create a modulation signal.</p> |
