Chord Signaling for High-Speed Data Movement: Employing Advanced Communication and Circuit Techniques to Augment Data-Transfer Bandwidth

Employing advanced communication and circuit techniques to augment data -transfer bandwidth. This article presents a class of signaling methods that improves the data rate of communication over copper channels without compromising its sensitivity to inter symbol interference (151). Chord signaling (CS) [1], [2] puts correlated data over multiple wires to improve the overall data -transfer bandwidth (BW), while maintaining resilience against common -mode (CM) and crosstalk (XTALK) noise, without adding circuit complexities. As a generalized form of differential signaling (DS), CS exploits proper spatial (multiwire) signaling to improve the aggregated BW and relax the required amount of equalization. Because CS is inherently very similar to conventional DS, most front-end circuits designed for DS can be reused for CS. This article also discusses advanced circuit design techniques, which are well matched with the proposed signaling method to keep ISI sensitivity low and reduce the energy consumption needed to transfer data over copper channels.