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Duobinary signaling for high speed serial communications has regained public focus in the last several years. This is particularly true when dealing with data rates beyond 50Gbps, with single channel over copper applications. With limited experience with duobinary signaling, system and SI engineers need to rely on end-to-end system level simulations. Today, IBIS-AMI specifications only support NRZ and PAM4 signaling. Hence, the existing IBIS-AMI specifications have to be modified such that duobinary signaling can also be supported.
This paper introduces IBIS-AMI modeling and simulation of duobinary signaling for high speed serial link systems. In this paper duobinary basics are first presented. The extension of IBIS-AMI modeling for duobinary signaling is then discussed, with details about required or suggested changes for both the TX and the RX. The feasibility of the proposed approach is demonstrated through case studies of simulating links at 100Gbps using an IBIS-AMI model on a commercial EDA tool.