Method and apparatus for reducing radiant noise energy by...

Details Method and apparatus for reducing radiant noise energy by... Method and apparatus for reducing radiant noise energy by...

2005-04-26

2005-04-26

Lee, Benny (Department: 2817)

Wave transmission lines and networks

Transmission line inductive or radiation interference...

C333S181000

Reexamination Certificate

active

06885258

ABSTRACT:
An EMI suppression apparatus allowing a common mode radiant noise energy to be reduced without attenuating a normal mode signal level is disclosed. A communication LSI has an earth terminal connected to the housing via a common mode impedance. A common mode choke composed of two coils having a mutual inductance is provided in the housing. One coil connects a signal terminal of the communication LSI to a signal transmission wire. The other coil connects the earth terminal of the communication LSI to the quasi-ground surface of the housing. The common mode chokes causes a common mode radiant noise generated by the common mode impedance to be removed from the signal transmission wire without affecting a normal mode signal flowing through the signal transmission wire.

REFERENCES:
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patent: 3832646 (1974-08-01), Szabo et al.
patent: 5220298 (1993-06-01), Nagase
patent: 5321373 (1994-06-01), Shusterman et al.
patent: 5969583 (1999-10-01), Hutchison
patent: 11-307986 (1999-11-01), None

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