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Fast adders using enhanced multiple-output domino logic

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5 Author(s)
Zhongde Wang ; VLSI Res. Group, Windsor Univ., Ont., Canada ; G. A. Jullien ; W. C. Miller ; Jinghong Wang
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Using an enhanced multiple output domino logic (EMODL) implementation of a carry lookahead adder (CLA), sums of several consecutive bits can be built in one nFET tree with a single carry-in. Based on this result, a new sparse carry chain architecture is proposed for the CLA adder. We demonstrate the design approach using a 32-b adder, and show that only four carries are sufficient for generating all sums, with a consequent reduction in the number of stage delays. Using a 1.2-μm CMOS technology, we verify our simulation procedures by fabrication and measurement of a 2.7 ns critical path

Published in:

IEEE Journal of Solid-State Circuits  (Volume:32 ,  Issue: 2 )