Design of ultrahigh-speed square wave pulser in a Brillouin sensing system
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摘要: 为了解决布里渊传感器技术中缺少超高速方波脉冲源的实际情况，实现总线较小的码间串扰及高速发送器通道较好的信号完整性，采用对系统中的敏感信号线进行串扰分析、建模及电磁场仿真分析并在此基础上进行制版测试的方法，提出了一种基于现场可编程门阵列器件的超高速脉冲源的设计方案，并进行了理论分析和实验验证。通过宽带示波器对实际板路的测量，取得了脉冲信号不同脉宽的时域波形及眼图数据。结果表明，输出脉冲的最小脉宽1ns，最大幅度1.0V，上升/下降时间均小于300ps，脉冲宽度在1ns~5ns间可调，重复频率在1kHz~10kHz间可调。这一结果对超高速脉冲源的设计理论的完善是有帮助的。Abstract: Because of the actual situation of the lack of ultrahigh-speed pulser for Brillouin sensor technique, the design method of an ultrahigh-speed pulser was introduced based on field-programmable gate array (FPGA) device. In order to achieve smaller inter-symbol interference and better signal integrity, the crosstalk, modeling and electro-magnetic field of sensitive signal were analyzed. The time-domain waveforms and eye diagrams of the pulse with different pulse width were measured with a broadband oscilloscope. The generated pulse was specified by the minimum pulse width of 1ns, the maximum swing of 1.0V and the rising and falling transition time of less than 300ps. The pulse width could range from 1ns to 5ns, while repetitive frequency could range from 1kHz to 10kHz. This result is helpful for improving the design of ultrahigh-speed pulsers.
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