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Invertible 16-bit RAC operation. (a) N-bit RCA is designed based on constructed invertible full adders; (b) clamping A and B working in directional mode (used for addition). The left is the statistics of S over a period, and the right is the statistics of 100 samples around the correct S; (c) clamping A and S working in inverse mode (used for subtraction); (d) only clamping S, and the statistics of A + B.
