Patent ID: 7760272

Claim:
A transmission line system, comprising a synchronization circuit for adding a synchronization pulse to a video signal, said synchronization pulse having amplitude at least fifty percent greater than said video signal, a transmission line having a loss and distortion characteristic for receiving the output of said synchronization circuit, and a filter network comprising a plurality of selectable filters configured to compensate said loss and distortion characteristic, said filters being selected to accommodate loss and distortion characteristics of lines of different length, a high-speed operational amplifier first clamp coupled to the output of said filters, the output of said operational amplifier first clamp being coupled to one end of a forward-biased semiconductor junction, the other end of said semiconductor junction being coupled to a second semiconductor clamp, said second semiconductor clamp having a second junction and exhibiting capacitance across said second junction, a third semiconductor clamp receiving the output of said second semiconductor clamp, said third semiconductor clamp being biased to cause a geometric increase in current flow through said third semiconductor clamp to regulate an undershoot condition at the output of said second semiconductor clamp.