FILTER CIRCUIT, LOGIC IC, MULTI-CHIP MODULE, FILTER-EQUIPPED CONNECTOR, TRANSMITTING APPARATUS AND TRANSMITTING SYSTEM

WIPO Patent Application WO/2005/117255

A1

A filter circuit, an optical module, an IC, a connector, a transmitting apparatus and a transmitting system having the filter circuit that reduces an induced current caused by an external magnetic field noise occurring from an adjacent circuit, suppresses electromagnetic noise radiated from an inductor, and resolves the problem of cost increase of ICs and transmitting apparatus. In a filter circuit composed of passive elements such as a capacitance element, inductors and so on, the inductors comprise two respective windings having central axes running in the vertical direction in the same plane but locating at different positions, and those windings are connected to each other in such a manner that the currents flow through the respective windings in mutually-reverse spiral fashions and that the induced current caused by the external magnetic field noise flows in the opposite direction.

KANAI HISAAKI (JP)
CHUJYOU NORIO (JP)

PCT/JP2005/009623

December 08, 2005

May 26, 2005

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HITACHI COMM TECH LTD (JP)
KANAI HISAAKI (JP)
CHUJYOU NORIO (JP)

H03H7/07; H03H1/00; H03H7/01; H03H7/06; H04B3/02; H05K1/16; H01F17/00; H05K1/02; H05K1/18; (IPC1-7): H03H7/07; H03H7/01; H04B3/02

WO2001011771A1

2001-02-15

JPH11122066A	1999-04-30
JPS5514719U	1980-01-30
JPH0423322U	1992-02-26
JPS5567158A	1980-05-21
JPH08167522A	1996-06-25
JP2003060401A	2003-02-28
JP2002190412A	2002-07-05
JP2001194553A	2001-07-19

Ogawa, Katsuo (No.17 Arai Building 3-3, Shinkawa 1-chom, Chuo-ku Tokyo 33, JP)

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