| 摘要 |
<p>In an image suppression receiver used in a heterodyne receiver or the like, an inter-signal error between I- and Q-signals becomes noise of image signal frequency components, resulting in a degradation in communication quality. In such a wireless communication apparatus, an image suppressing circuit of a high performance is achieved. There are included two image suppressing circuits (6-1,6-2). One of the image suppressing circuits (6-1) exchanges the I- and Q-signals to cause the signals, which are the input signals of a desired wave though, to be regarded as image signals, thereby suppressing them. The other of the image suppressing circuits (6-2) regards the input signals as the desired wave and passes them without loss. An I/Q signal adjusting circuit adjusts the phases or amplitudes of I- and Q-signals such that the ratio of the output levels of the image suppressing circuits (6-1,6-2) is maximized. In this way, an image suppression receiver of a high performance is achieved.</p> |
