A System for Calibrated Realtime Measurement of Mixed-Mode Waves on High-Speed Data Links

This paper presents a measurement system for calibrated realtime measurement of differential and common mode signals in differential high-speed data links. In contrast to existing differential coupler measurement systems, a reconstruction of absolute voltage signals in a defined calibration plane is enabled by a frequency domain calibration. The system is verified in simplex and full-duplex data transmission links, showing good performance. A corresponding measurement system is used to perform signal integrity analysis in differential high-speed communication systems, such as automotive Ethernet.