PAM-4 capability enhances advanced design system channel simulator
The introduction of the PAM-4 capability further advances Keysight’s position in the IBIS-AMI SerDes channel simulation arena.
With Keysight’s new ADS PAM-4 capability, system designers can now use PAM-4 IBIS-AMI models within the industry standard ADS Channel Simulator. Developed in collaboration with leading PAM-4 SerDes IC vendors, the ADS Channel Simulator provides a trusted bit-by-bit simulation engine for PAM-4. The new technology enables system designers to easily compare the various design tradeoffs between non-return-to-zero (NRZ) and PAM-4 signaling technologies.
PAM-4 is a signaling technology utilized for high-speed SerDes links over electrical backplanes that are attempting to deliver a data rate of greater than 56 Gbps per lane. For system designers, a key challenge with PAM-4 is simulation accuracy during serial-link design. Traditional EDA software simulations only consider 2-level signaling. PAM-4 signals however, are affected by conventional impairments (e.g., jitter, noise, channel loss and inter-symbol interference) in unconventional ways; only for the resulting eye measurements to be further complicated by new receiver behavior (three slicer thresholds, individual slicer timing skew, equalization, and clock and data recovery) introduced to minimize the symbol error rate. Accurately understanding how each of these variables influence specific design trade-offs for PAM-4 links requires a channel simulator with the ability to handle PAM-4 IBIS-AMI models from SerDes vendors.
The ADS Channel Simulator with PAM-4 capability features a number of new built-in measurements that can capture effects such as slicer threshold levels and how they adapt over time, timing skew for each slicer, and multi-tap decision feedback equalization. The software’s accurate measurement techniques specifically provide the symbol-error-rate contours for each PAM-4 eye.
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