aaron_do
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Hi,
it sounds like double reflection simply means reflection at the load, and re-reflection at the source. So without the 75-ohm resistor, the buffer would have an output imepdance close to zero.
What is the impedance of the transmission line? In theory, if the impedance is 50-ohm, then the load reflection will be minimized. In that case I can't see why you need an additional 75-ohm resistor. If Z0 is 75-ohm however, then the source re-reflection will be minimized.
Whatever it is it sounds fishy. Just my thoughts.
regards, Aaron
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