| 摘要 |
<P>PROBLEM TO BE SOLVED: To reduce the occupation area of devices and patterns on the board of a radio circuit such as a portable communication terminal. <P>SOLUTION: A reception I/Q signal is not inputted to an orthogonal modulator 46 owing to interruption by LPFs 47, 48 and is not inputted to D/A converting parts 69, 70 owing to the interruption by LPFs 67, 68. An output I/Q signal is not inputted to A/D converting parts 65, 66 owing to the interruption by BPFs 63, 64 and is not inputted to an orthogonal demodulator 43 owing to the interruption by HPFs 44, 45. Consequently, mutual influence is not performed even when an RF part 40 is connected to a BB part 60 via a common interface 50. Thus, the number of the terminals of the RF part 40 corresponding to a reception I signal, a reception Q signal, a transmission I signal, and a transmission Q signal becomes two, the number of the terminals of the BB part 60 becomes two, and the patterns on the printed board becomes two. Accordingly, the occupation area of the RF part 40, the BB part 60, and the patterns is reduced, so that a digital radio circuit is easily miniaturized. <P>COPYRIGHT: (C)2006,JPO&NCIPI |
