here's a cool logic gate. it's a single XOR gate, but it's fully differential AND it runs at 30GHz!
datasheet.
adsantec.com/wp-content/upl…
it's a bit expensive though, at $770 each. imagine building a computer out of these things. maybe a simple 8-bit computer. but you'd need about a million bucks
cool, it has a pair of pins called "dapper dan"
same company has a 50GHz D flip-flop. that would be good for a fast register file. only $1K per bit.
there are a lot of difficulties designing with logic like this. due to signal integrity constraints, fanout is 1.
you'd need a signal buffer like this if your gate output needs to connect to more than one input.
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