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In electronics, an adder is a combinatorial or sequential logic element which computes the (n+1)-bit sum of two n-bit numbers. The Brent–Kung adder proposed in 1982  is one of the most advanced designs, having a gate level depth of .
- Brent, R. P. & Kung, H. T. "A Regular Layout for Parallel Adders". IEEE Transactions on Computers, 1982, C-31, 260-264
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