Patent ID: 8184028

Claim:
A video data source system connected to a transmission interface having an equivalent impedance, comprising: a video encoding unit for receiving a digital signal that represents video data, encoding the digital signal, and generating an encoded digital signal; a digital-to-analog converter for receiving the encoded digital signal and converting the received encoded digital signal into a video analog signal; and a post-stage driving unit for reducing an output current from the digital-to-analog converter, the post-stage driving unit receiving the video analog signal and generating an adjusted analog signal to drive a post-stage component; wherein the post-stage driving unit comprises: a resistor having a resistance greater than the equivalent impedance; and an operational amplifier, wherein a first input terminal of the operational amplifier is connected to one end of the resistor to form an input node for receiving the video analog signal, a second input terminal of the operational amplifier receives a reference voltage, and an output terminal of the operational amplifier is coupled to the transmission interface and the other end of the resistor to form an output node for generating the adjusted analog signal.