Neat. Thanks for sharing.
With a XOR, you can't tell which input is higher frequency. I think you can
fix that with a second XOR and a delay line.
I think 90 degrees of delay will provide the most information. At 10 MHz,
that's 25 ns. I think that's about 15 feet of good coax.
all that spaghetti made me wonder if you can get it on a chip . yes, it
seems. ex EP8034, 200ns in tenths. there are others of course.
http://www.minicircuits.com/pdfs/JSPHS-12.pdf
It's not digital. It is an alalog adjustable voltage controlled phase
shifter. If you want to shift a relatively clean 10Mhz sine...
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