A Low-power Carry Cut-Back Approximate Adder with Fixed-point Implementation and Floating-point Precision

This paper introduces an approximate adder architecture based on a digital quasi-feedback technique called Carry Cut-Back in which high-significance stages can cut the carry propagation chain at lower-significance positions. This lightweight approach prevents activation of the critical path, improving energy efficiency while guaranteeing low worst-case relative error. It offers a degree of freedom which allows to dissociate precision and dynamic range in fixed-point implementation. A design methodology is presented along with results and a comparative study. For a worst-case accuracy of 98%, energy savings up to 44% and power-delay-area reductions up to 62% are demonstrated compared to low-power conventional designs.


Published in:
Proceedings of the 53rd Annual Design Automation Conference, 127:1-127:6
Presented at:
2016 ACM/EDAC/IEEE Design Automation Conference (DAC), Austin, Texas, USA, June 5-9, 2016
Year:
2016
Publisher:
New York, Ieee
ISBN:
978-1-4503-4236-0
Keywords:
Laboratories:




 Record created 2016-06-23, last modified 2018-03-17


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