| 摘要 |
PROBLEM TO BE SOLVED: To execute RF-AGC processing based on DSP with less power consumption without using a special AD converter adaptable to high-frequency input. SOLUTION: A control circuit is provided with an A/D conversion circuit 10 for converting a wide-band intermediate frequency signal to be output from a frequency conversion circuit 5 into a digital signal; and a DSP 11 for generating control data for controlling the gains of an antenna damping circuit 3 and an LNA 4, on the basis of the level of a wide-band digital intermediate frequency to be outputted from the A/D conversion circuit 10 and outputting the generated data. The control circuit applies A/D conversion to the wide-band intermediate frequency signal to be output from the frequency conversion circuit 5, and supplies it to the DSP 11. In this way, the frequency of an input signal to the A/D conversion circuit 10 can be reduced, and thus, the necessity of using a special AD converter adaptable to a high-frequency input can be eliminated, and the power consumption can also be reduced. COPYRIGHT: (C)2008,JPO&INPIT
|
