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Title:
FILTER DEVICE
Document Type and Number:
WIPO Patent Application WO/2007/116974
Kind Code:
A1
Abstract:
Provided is a switched capacitor type filter device having a steep characteristic with a small number of taps. 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 realize an FIR filter having a steep characteristic.

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Inventors:
MATSUOKA AKIHIKO
MIYANO KENTARO
ABE KATSUAKI
Application Number:
PCT/JP2007/057778
Publication Date:
October 18, 2007
Filing Date:
April 06, 2007
Export Citation:
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Assignee:
MATSUSHITA ELECTRIC IND CO LTD (JP)
MATSUOKA AKIHIKO
MIYANO KENTARO
ABE KATSUAKI
International Classes:
H03H15/00; H03D7/00; H03H19/00; H04B1/26
Foreign References:
JPS5671324A1981-06-13
US20030050027A12003-03-13
JP2003317026A2003-11-07
JP2006066178A2006-03-09
Attorney, Agent or Firm:
WASHIDA, Kimihito (Shintoshicenter Bldg.24-1, Tsurumaki 1-chom, Tama-shi Tokyo 34, JP)
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