基于千兆以太网的信号传输再生仪设计

Signal Transmission Regenerator Design Based onGigabit Ethernet Protocol

基于以太网协议,设计了一种采用千兆网线作为传输介质的新型信号传输再生仪,可将采样前端与再生后端完全分开放置,传输距离仅受网线长度的限制且可任意增加交换机实现更灵活的信号中继,多路信号可共用同一网络传输,并加入了网络时延自动测量补偿系统,保证了再生信号与原始信号严格同频同相,采用FPGA作为处理核心以增加并行性和实时性,实测典型信号的再生幅度和频率误差均小于1%,幅相抖动远小于已有的微处理器方案,可广泛用于各类高精度远程信号再生系统中.

A new-style signal transmission regenerator based on ethernet protocol was designed,whose transmission medium was common-used gigabit ethernet cable.In presented design,sampling front-end and regenerator back-end can be placed individually,and the transmission distance can be enlarged arbitrary via switches for more flexible relay strategy.Multi-channel signal can be transmitted in the same network correctly,too.Automatic network delay time measurer was instanced internally to attain the same frequency and phase with sampling signal.Whole system’s processing core is FPGA to utilize its parallel and real-time ability.The relative amplitude/frequency error between regenerated signal and original signal was lower than 1%after practical test.Amplitude/frequency jitter was decrease greatly,showing its superb performance compared with MCU-based strategy.Presented design can be widely used in high-precision remote signal regenerating system,such as intelligent factory,automatic monitor lab.