Sampling point detection circuit, transmission system, pre-emphasis strength adjustment method, logic analyzer, and, evaluation method to evaluate the transmission line

摘要

A sampling point detection circuit 1 comprises: means 11 for setting amplitude division lines along a time axis and time division lines along an amplitude axis of an eye diagram; means 12 for calculating a virtual circle that is inscribed in a divided region having the smallest area among divided regions obtained when a region that is defined by segments each connecting intersections of a bit error rate contour line of the eye diagram and the amplitude division line and intersections of the bit error rate contour line and the time division line and that contains an intersection of the amplitude division line and the time division line is divided by the amplitude division line and time division line; and means 13 for determining, as a sampling point, the intersection of the time division line and the amplitude division line that are set when the largest virtual circle among the virtual circles is calculated.