Cascaded carry-select adder (C2SA): a new structure for low-power CSA design

  • Authors:
  • Yiran Chen;Hai Li;Kaushik Roy;Cheng-Kok Koh

  • Affiliations:
  • Purdue University, West Lafayette, IN;Qualcomm Inc., San Diego, CA;Purdue University, West Lafayette, IN;Purdue University, West Lafayette, IN

  • Venue:
  • ISLPED '05 Proceedings of the 2005 international symposium on Low power electronics and design
  • Year:
  • 2005

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Abstract

In this paper we propose a novel low-power Carry-Select Adder (CSA) design called Cascaded CSA (C2SA). Based on the prediction of the critical path delay of current operation, C2SA can automatically work with one or two clock-cycle latency and a scaled supply voltage to achieve power improvement. Post-layout simulations of a 64-bit C2SA in 180nm Technology show that C2SA can operate at a lower supply voltage, attaining 40.7% energy saving, while maintaining a similar (average) Latency Per Operation (LPO) compared to standard CSA