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ds90ub914a 视频闪烁

前端摄像头是用ds90ub913a,中间用同轴连接方式,后端接受ds90ub914a。给摄像头供电用12V;输出 BT656格式,到屏幕后,发现图像有时候有闪烁。似乎有干扰,请问是什么原因造成的。12V的耦合?还是同轴线太长(7m)?还是layout有问题?