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DS90UR241芯片的输入信号和时钟是由FPGA送入,信号电平设置LVCMOS,时钟为20MHz;DS90UR241芯片的电路应该没有问题,DEN、TRFB设为高电平,输出的LVDS信号始终是1.2V左右的固定电平(峰峰200mv),而且改变输入信号,但输出还是一样的。不知道DS90UR241正常的输出信号是什么样的?