| 摘要 |
<p>PURPOSE:To perform I/Q detection with high reliability, by performing the processing of a receiving signal up to A/D conversion processing by a single system and operating a same phase component (I) and an orthogonal component Q by a digital filter. CONSTITUTION:A receiving signal X(t) becomes a digital signal Xn through the mixer 10 and A/D converter circuit 40 of a single system to be inputted to a digital filter 500. The signal Xn is applied to a filter 53 to output the difference between the data corresponding to the sampling at the certain point of time of the signal Xn and the data corresponding to the sampling before two samples to filters 51, 52. By applying filter processing to the signal Xn by the filter 500, a digital signal iP from which the 0 frequency component thereof is removed by outputted from the filter 51 corresponding to an I- component and a digital signal qP from which the 0 frequency component thereof is removed is outputted from the filter 52 corresponding to a Q-component. As mentioned above, by removing the 0 frequency component by the filter 500, the reliability of I/Q detection can be enhanced.</p> |
