| 摘要 |
PROBLEM TO BE SOLVED: To provide a charged main filter circuit for preventing a signal from being deteriorated when passing a broadband signal. SOLUTION: The charged main filter circuit 120 comprises an SINC filter circuit 140, where frequency characteristics have SINC function characteristics, and a BPF 160 that is connected to the poststage of the SINC filter circuit 140 and has frequency characteristics with a prescribed frequency as the center one. In this case, the BPF 160 subtracts one portion of previous sampling output from current sampling output in synchronization with the clock of the SINC filter circuit 140, and compensates the frequency characteristics of the SINC filter circuit 140. COPYRIGHT: (C)2008,JPO&INPIT
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