CIRCUIT USING CHOKE COIL AND CHOKE COIL

WIPO Patent Application WO/2004/061877

A1

The winding (36) of a choke coil (31) is densely wound in a single layer around the outer periphery of tubular barrel (33) of a bobbin (32), and a winding (37) is densely wound in a single layer over the winding (36). A winding (46) is densely wound in a single layer around the outer periphery of tubular barrel (43) of a bobbin (42), and a winding (47) is densely wound in a single layer over the winding (46). Windings (36), (37), (46), (47) are wound so as to mutually intensify magnetic fluxes when an in-phase noise current flows. Windings (36, 37) carry out a differential transmission communication and are connected with a pair of signal lines working as the go path of a power supply current. Windings (46, 47) carry out a differential transmission communication and are connected with a pair of signal lines working as the return path of a power supply current. Accordingly, a circuit using a choke coil small in size, large in inductance, and excellent in high-frequency characteristics, and the choke coil are provided.

NISHIKAWA YOSHIE (JP)
IGASHIRA KIYOTERU (JP)
OOI TAKAAKI (JP)
YAMADA TATSUYUKI (JP)
KUMATANI HIDEKI (JP)

PCT/JP2003/015209

July 22, 2004

November 28, 2003

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MURATA MANUFACTURING CO (JP)
NISHIKAWA YOSHIE (JP)
IGASHIRA KIYOTERU (JP)
OOI TAKAAKI (JP)
YAMADA TATSUYUKI (JP)
KUMATANI HIDEKI (JP)

H01F17/04; H01F30/00; H01F37/00; H01F17/06; H01F27/30; H01F27/32; (IPC1-7): H01F30/00; H01F17/04

JP2001223117A	2001-08-17
JPH11135330A	1999-05-21
JPH10261521A	1998-09-29

None

PATENT SEC., INTELLECTUAL PROPERTY DEPT. MURATA MANUFACTURING CO., LTD. (Tenjin 2-chom, Nagaokakyo-shi Kyoto, JP)

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