Simulation and Design of a 56Gbps Cross-backplane Transmission Channel

Over the past decade, new technologies and applications such as artificial intelligence, cloud services, and big data have led to an exponential increase in Internet-connected devices and data traffic. This puts forward higher requirements for bandwidth and stability of data transmission. In order to achieve the goal of device integration and miniaturization, the backplane structure is often used to realize the interconnect between board and card systems. The backplane is used as the basis for data exchange. However, the long-distance transmission across the backplane will cause serious losses and various signal integrity problems. In recent years, with the development of serial transmission, 56Gbps PAM4 modulation transmission has gradually shown transmission efficiency beyond 28Gbps NRZ. The change of modulation mode brings an inherent loss of 9.5dB, and PAM4 modulation has more stringent requirements on signal integrity. In this paper, ADS is used to model and simulate the cross-backplane long-distance transmission channel, and a set of high-speed transmission channel design scheme based on OIF CSI-56G-LR specification is established from the aspects of plate, laminates and holes.