Twisted-Pair Video Cable Driver and Receiver Circuit Schematic Diagram
semiconductor application notes April 8th, 2010Twisted pair wiring is one of the wiring technique usually used for in-building data communication. The difference with the conventional coaxial table is it offers substantial cost saving for video transmission on the same medium. Differential driver is used to launch a baseband camera signal to the twisted pair. The twisted pair exhibits a roll-off characteristics which need equalization to correct for. Below circuit shows the differential driver and the corrector.
Two LT6652 ICs are used. One for creating a gain of +1, and the other to create gain of -1. Another function of the LT6652 is to reject any ground noise and prevent ground loops via the coaxial cable shield. The signal is then terminated and re-amplified to re-create an unbalanced output for connection to recorders, display monitors, etc. To make up the losses during transmission, the amplifier must provide two times gain required output drive. [Source : Linear Technology Application Notes]
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