双通道任意波形发生器信号间耦合问题的研究

Study on the problem of signal coupling between two channel arbitrary waveform generator

针对双通道任意波形发生器信号间相互干扰导致输出波形严重失真的问题,本文从板级电源完整性和信号完整性出发,采用目标阻抗法重新设计系统的去耦电容网络,使电源阻抗在整个工作频率范围内都达到设计要求,进而使电源噪声控制在可接受范围内,使用Polar SI9000设计合理的层叠结构和线宽线距使信号线满足可控阻抗传输线要求。利用Cadence Sigrity 16.6仿真软件对所设计的系统进行仿真模拟,最后在硬件平台上测试,测试结果表明,第一版系统中出现的两路信号通道相互干扰问题得到解决,很好的改善了输出波形信号质量。

To deal with the problem of severe distortion of the output waveform caused by the interference between the dual channel arbitrary waveform generator,this paper based on the theory of broad level power integrity and signal integrity theory,uses the target impedance method to design the decoupling capacitor network,to make the power＇s impedance meets our design in the whole pass band,and in a further step,to make the power supply noise control in the acceptable range.Using SI9000 Polar to design a reasonable structure and line width,the signal line can meet the requirement of controllable impedance transmission line.Using the simulation software Cadence Signity 16.6to simulate the system,and then tested on the hardware platform,the test results show that the interference between two channels＇ signal is solved,the quality of the waveform signal has been greatly improved.