Los Frijoles
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Lately I have been designing a device which requires an isolated high speed data link. I came across LVDS as how many high speed serial links are accomplished. However, I need to isolate it electrically from the receiving end and so I was wondering how that could be done.
I had an idea that one could use a 1:1 ratio balun like so since they are transformers essentially designed for higher frequencies, but I am not sure this gives enough isolation (I am going for a minimum of 500V isolation):
I also thought of using conventional optoisolators or galvanic isolators, but isolators at the speeds I would like (100mbps or greater) either don't exist or are expensive (this is a hobby project with the goal being to keep costs down).
Any thoughts?
I had an idea that one could use a 1:1 ratio balun like so since they are transformers essentially designed for higher frequencies, but I am not sure this gives enough isolation (I am going for a minimum of 500V isolation):
Code:
+LVDS---- --------
)||(
)||(
)||(
-LVDS---- --------
LVDS Balun Receiver side
side with terminating resistor (not shown)
I also thought of using conventional optoisolators or galvanic isolators, but isolators at the speeds I would like (100mbps or greater) either don't exist or are expensive (this is a hobby project with the goal being to keep costs down).
Any thoughts?