| 摘要 |
PROBLEM TO BE SOLVED: To provide a switched capacitor filter device having a steep characteristic with a small number of taps. SOLUTION: The filter device includes positive polarity selecting switches 1311 to 1354, negative polarity selecting switches 1411 to 1454, positive read-out switches 1711 to 1754, negative polarity read-out switches 1811 to 1854, and a timing control unit 5. Thus, it is possible to read out a negative charge by controlling the polarity upon write-in and the polarity upon read-out to be identical or different. Accordingly, it is possible to set a negative coefficient as a filter weighting coefficient. This can achieve an FIR filter having a steep characteristic. COPYRIGHT: (C)2009,JPO&INPIT |
