Patent ID: 8355428

Claim:
A data receiving device for receiving digital data via a differential signal transmission path made up of two or more channels including one channel of a reference clock, comprising: a digital data receiver configured to receive various data channel signals transmitted from the transmitter side to said differential signal transmission path; a reference clock receiver configured to receive a reference clock transmitted from the transmitter side to said differential signal transmission path; and a transmission loss rate determining unit configured to determine the attenuation amount of transmission path, based on waveform deterioration resulting from the reference clock received at said reference clock receiving unit having passed through said differential signal transmission path, wherein said transmission loss rate determining unit determines a transmission loss of the signal at said differential signal transmission path, based on a rate of waveform deterioration of the reference clock, based on the time difference between the leading edge time and the trailing edge time, which are two periods of time within a positive half side of a complete clock cycle, having a positive voltage slope (dV/dt>0) and negative voltage slope per time (dV/dt<0), respectively, wherein said transmission loss rate determining unit further comprising: a full-wave rectifier configured to rectify a deteriorated clock waveform received at said reference clock receiving unit; a differentiator that configured to reform the deteriorated clock waveform subjected to the full-wave rectifying into a differential differentiated waveform; a comparator configured to align said differential differentiated waveform with a differential waveform with a voltage amplitude value; and an integrator configured to integrate the differential waveform with a voltage amplitude value as to full cycle time and takes the time difference between the positive voltage value and negative voltage as the differential voltage value.