为利用低成本UTP双绞线实现高清VGA模拟视频信号的远距离传输, 完成了VGA模拟差分信号的远距离传输系统的设计及实现。在发送端, 通过差分驱动芯片AD8147对信号进行驱动; 在接收端, 采用差分接收和均衡器AD8123芯片对信号进行均衡和补偿, 恢复原始视频信号。实验证明, 该系统可以在CAT-5e类UTP双绞线上实现最大距离300m、720P分辨率的高清VGA模拟视频信号的远距离传输, 传输后的视频图像清晰、色彩饱满。

In order to transmit the long-distance HD video with twisted pair cable, a long-distance transmission system of VGA analog differential signal is designed and the circuits are completed. The signal is driven by AD8147 chip on the sending side and is restored by AD8123 chip through balancing and compensating on the receiving end. The experiments show that, the system is able to transmit 720P HD video with no distortion using maximum 300 meters CAT-5e twisted pair cable. The video image is clear and the color is full after transmission.