Patent ID: 7339443

Claim:
A common mode radiation inhibit circuit comprising: a differential transmission line which is constituted of a pair of signal wiring, and transmits differential signals; a signal ground of the differential transmission line which is arranged along the differential transmission line, and has a change point on its way; a transformer; and a reference ground, wherein a primary side of the transformer is connected between an electric midpoint of the pair of signal wiring, and the signal ground at one side of the front and back of the change point of the signal ground; wherein the secondary side of the transformer is connected between the electric midpoint of the pair of signal wiring and the signal ground at another side of the front and back of the change point of the signal ground; and wherein the reference ground is connected to a point which becomes a neutral sheet of the primary side of the transformer and a point which becomes a neutral sheet of the secondary side of the transformer.