| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a filter device capable of obtaining a desired filter band characteristic by an arbitrary reference signal frequency and varying the filter band, and to provide a transceiver using the same. <P>SOLUTION: The filter device includes a filter 13 for signal processing, a filter adjustment circuit 16a for adjusting frequency characteristic of the filter 13 to a predetermined characteristic, and a reference signal source for supplying reference signal to the filter adjustment circuit 16a. The reference signal source is a frequency synthesizer 20. The frequency synthesizer 20 outputs an oscillation signal oscillated at the frequency required for the filter adjustment circuit 16a, and uses the oscillation signal as the reference signal of the filter adjustment circuit 16a when the filter adjustment circuit 16a adjusts the filter 13. <P>COPYRIGHT: (C)2008,JPO&INPIT |
