Patent ID: 8676058

Claim:
A differential transmission circuit, in which a differential transmission signal output by a driving circuit performing driving at a predetermined bit rate is transmitted, the circuit comprising: a grounded conductive layer; a pair of transmission line conductors which is disposed on one side of the grounded conductive layer via a dielectric layer interposed therebetween; a conductive film which has a predetermined shape and is disposed between the grounded conductive layer and the pair of transmission line conductors; a via hole which connects the grounded conductive layer to the conductive film; a straight-line region in which the pair of transmission line conductors extends parallel to each other so as to have a first width; and a band rejection filter region in which the pair of transmission line conductors planarly overlaps the conductive film, when viewed from an upper side of the grounded conductive layer, and extends parallel to each other so as to have a second width narrower than the first width and a common mode of the differential transmission signal is attenuated at one of frequencies which are natural number multiples of a frequency corresponding to the predetermined bit rate.