Ripple-borrow binary subtraction circuit

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There is nothing special about the implemented logic. It is a straight-forward "full subtractor". The patent must be about the clever implementation for the borrow output, using "discrete" MOSFETs.
Maybe it is extra fast because the borrow chain pass through only transmission gates.
 

it is extra fast because the borrow chain pass through only transmission gates.
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What are you comparing transmission gates to ?
 

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