Multimode signaling on non-ideal channels

Circuit/channel co-design methodology for multimode signaling

“…The numbers in the CODEC matrices given are rounded approximations for implementation. To evaluate the frequency domain performance of the baseline channel and the effectiveness of the CODEC derived, we plot the original reduced S-parameter matrix S and the modified reduced S-parameter matrix 1 T ST  in dB. To make the plot concise, only two traces out of four are plotted here.…”

“…However, high density chip-to-chip links tend to suffer from severe crosstalk noise. A crosstalk cancellation coding scheme referred to as multimode signaling offers the ability to improve wiring density but so far has been investigated mainly for uniform channels and channels with small discontinuities [1]- [4]. To make best use of crosstalk cancellation by multimode signaling in real world applications, practical channels including packages, sockets and printed circuit boards (PCBs) need to be considered.…”