Title:
VARIABLE ATTENUATOR
Document Type and Number:
WIPO Patent Application WO/2005/064791
Kind Code:
A1
Abstract:
There is provided a variable attenuator controllable effectively and continuously and having small manufacturing irregularities. The variable attenuator includes: a first signal input terminal; a first signal output terminal; a first control terminal for inputting control voltage; an analog/digital converter for converting the control voltage to M (M is an integer not smaller than 2) control signals; and N (N is a positive integer satisfying N ≥ M) variable impedance elements connected in parallel and/or in series between the first signal input terminal and the first signal output terminal and having impedance changed by any of the control signals.
Inventors:
KOJIMA IWAO
Application Number:
PCT/JP2004/018223
Publication Date:
July 14, 2005
Filing Date:
December 07, 2004
Export Citation:
Assignee:
MATSUSHITA ELECTRIC IND CO LTD (JP)
KOJIMA IWAO
KOJIMA IWAO
International Classes:
H03G1/00; H03M1/12; H03H11/24; H03K19/0175; H03M1/38; (IPC1-7): H03H11/24
Foreign References:
| JP2001519613A | 2001-10-23 | |||
| JPS6430315A | 1989-02-01 | |||
| JPH0837437A | 1996-02-06 | |||
| JPH0946176A | 1997-02-14 | |||
| JP2003309454A | 2003-10-31 |
Attorney, Agent or Firm:
Higashima, Takaharu (IMP Building 3-7, Shiromi 1-chome, Chuo-k, Osaka-shi Osaka, JP)
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