Скачать или смотреть ECOC 2017 Demo: PAM-4 Simulation for analyzing trade-offs for High-Speed Digital Links

The ADS channel simulation enables a comparison of PAM-4 versus NRZ technology. This example demonstrates the concept of price vs performance in PCB design. Cheaper PCB materials with more loss and no-backdrilling of vias are more likely to exhibit resonances at higher frequencies. This channel may not support NRZ to 56Gbps, but will support PAM-4 more easily, assuming that the resonances are higher in frequency than the main spectral content of the PAM-4 signal. For the system designer attempting to compare NRZ to PAM-4 trade-offs, an immediate need exists to use PAM-4 IBIS-AMI models from SerDes vendors within their Channel Simulation. Through Keysight Technologies' continuing leadership in the IBIS Open Forum, Keysight EEsof EDA now offers support for the new IBIS v6.1 specification. Developed in collaboration with the industry's leading PAM-4 SerDes IC vendors, the ADS Channel Simulator provides a trusted bit-by-bit simulation engine for PAM-4.