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Energy-efficient inexact speculative adder with high performance and accuracy control

Vincent Camus, Jeremy Schlachter, Christian Enz
2015 2015 IEEE International Symposium on Circuits and Systems (ISCAS)  
This general topology of speculative adders improves performance and enables precise accuracy control.  ...  Inexact and approximate circuit design is a promising approach to improve performance and energy efficiency in technology-scaled and low-power digital systems.  ...  CONCLUSION This paper has proposed a general architecture of Inexact Speculative Adder (ISA) with high performance and adaptable accuracy.  ... 
doi:10.1109/iscas.2015.7168566 dblp:conf/iscas/CamusSE15 fatcat:cfnc2nl5g5f7vjun543a2p6k5a

Energy-efficient digital design through inexact and approximate arithmetic circuits

Vincent Camus, Jeremy Schlachter, Christian Enz
2015 2015 IEEE 13th International New Circuits and Systems Conference (NEWCAS)  
Inexact and approximate circuit design is a promising approach to improve performance and energy efficiency in technology-scaled and low-power digital systems.  ...  This paper reviews two established techniques applicable to arithmetic units: circuit pruning and carry speculation. A critical comparative study is carried out considering several error metrics.  ...  INTRODUCTION Approximate computing has become a major field of research in the sense that it could significantly improve energy efficiency and performances of modern digital circuit.  ... 
doi:10.1109/newcas.2015.7182028 dblp:conf/newcas/CamusSE15 fatcat:slddacvozfb3fok4u6vgv4jxcq

Design of Inexact Speculative Adder for High Performance Applications

G Ravi Kumar Reddy, Asst. Professor, CVR College of Engineering/ECE Department, Hyderabad, India.
2019 CVR Journal of Science & Technology  
The Inexact Speculative Adder (ISA) design therefore, improves speed, reduces power consumption, propagation delay and accuracy management due to a short speculative path and to an error compensation technique  ...  The low power and less area are equally vital in the implementation of high speed adders.  ...  The conventional topology of speculative adders improves performance and enables precise accuracy control.  ... 
doi:10.32377/cvrjst1607 fatcat:psf3sfxntje3vjucczkofnrsx4

Near/Sub-Threshold Circuits and Approximate Computing: The Perfect Combination for Ultra-Low-Power Systems

Jeremy Schlachter, Vincent Camus, Christian Enz
2015 2015 IEEE Computer Society Annual Symposium on VLSI  
Inexact and approximate circuit design can address these issues by trading calculation accuracy for better silicon area, circuit speed and even better power consumption.  ...  While sub/near-threshold design offers the minimal power and energy consumption, such approach strongly deteriorates circuit performances and robustness against PVT (process/voltage/temperature) variations  ...  Generally, ISA adders built out of small subadders show high errors and high savings (on the left of the figures), whereas ISA with large sub-adders are preferred for low errors and lower savings (on the  ... 
doi:10.1109/isvlsi.2015.41 dblp:conf/isvlsi/SchlachterCE15 fatcat:tsrdmishnrd5bgceujiahg3sfa

Combining structural and timing errors in overclocked inexact speculative adders

Xun Jiao, Vincent Camus, Mattia Cacciotti, Yu Jiang, Christian Enz, Rajesh K. Gupta
2017 Design, Automation & Test in Europe Conference & Exhibition (DATE), 2017  
In this paper, we use Inexact Speculative Adders, which redesign the adder architecture to shorten its critical path and improve performance, but introduces controlled structural errors.  ...  Worst-case design is used in IoT devices and high performance data centers to ensure reliability, leading to a power efficiency loss.  ...  This compromise between the two error contributions gives generally a better overall accuracy than adders designed with high structural accuracy. D.  ... 
doi:10.23919/date.2017.7927037 dblp:conf/date/JiaoCCJEG17 fatcat:t33sexwk3bgm5mmzgfn3kkpq6q

Approximate 32-bit floating-point unit design with 53% power-area product reduction

Vincent Camus, Jeremy Schlachter, Christian Enz, Michael Gautschi, Frank K. Gurkaynak
2016 ESSCIRC Conference 2016: 42nd European Solid-State Circuits Conference  
By combining two state-of-the-art techniques of imprecise hardware, namely Gate-Level Pruning and Inexact Speculative Adder, and by introducing a novel Inexact Speculative Multiplier architecture, three  ...  Accuracy loss has been evaluated with a high-dynamic-range image tone-mapping algorithm, resulting in small but non-visible errors with image PSNR value of 90 dB.  ...  ACKNOWLEDGMENT The authors would like to thank the Integrated Systems Laboratory at ETHZ for supporting the fabrication costs and for providing support and equipments for the design and measurement of  ... 
doi:10.1109/esscirc.2016.7598342 dblp:conf/esscirc/CamusSEGG16 fatcat:clvvx2d2zzgp7nim53xp3hiday

Approximate FPGA Implementation of CORDIC for Tactile Data Processing Using Speculative Adders

Marta Franceschi, Vincent Camus, Ali Ibrahim, Christian Enz, Maurizio Valle
2017 2017 New Generation of CAS (NGCAS)  
This paper presents the first case study of applying Inexact Speculative Adders (ISA) to the FPGA implementation of a Coordinate Rotation Digital Computer (CORDIC) module within the Machine Learning algorithm  ...  In most robotic and biomedical applications, the interest for real-time embedded systems with tactile ability has been growing.  ...  Among numerous speculative adders [24] , the Inexact Speculative Adder (ISA) [22] is a general and optimum architecture of speculative addition to improve speed, power efficiency and accuracy management  ... 
doi:10.1109/ngcas.2017.40 dblp:conf/ngcas/FranceschiCIEV17 fatcat:kkf4gomod5co7o5ygoschp6koy

Approximate computing: An emerging paradigm for energy-efficient design

Jie Han, Michael Orshansky
Approximate computing has recently emerged as a promising approach to energy-efficient design of digital systems.  ...  By relaxing the need for fully precise or completely deterministic operations, approximate computing techniques allow substantially improved energy efficiency.  ...  The three AXAs in [23] show attractive operational profiles in performance, hardware efficiency and power-delay product (PDP), while with a high accuracy (AXA3 in Fig.1 ).  ... 
doi:10.1109/ets.2013.6569370 dblp:conf/ets/HanO13 fatcat:wimm6r5hnneo5ltdwtrw5lztvu

Design of Approximate Circuits by Fabrication of False Timing Paths: The Carry Cut-Back Adder

Vincent Camus, Mattia Cacciotti, Jeremy Schlachter, Christian Enz
2018 IEEE Journal on Emerging and Selected Topics in Circuits and Systems  
The CCBA outperforms both state-of-the-art and truncated adders for high-accuracy and low-power circuits, confirming the interest of the proposed concept to help building highly-efficient approximate or  ...  This lightweight approach prevents the logic activation of the carry chain, improving performance and energy efficiency while guaranteeing low worst-case errors.  ...  The ISA improves accuracy while strongly outperforming other speculative adders in terms of speed and energy efficiency.  ... 
doi:10.1109/jetcas.2018.2851749 fatcat:ipjio2mucva3lju62xnz64t74e

Adaptive simulation-based framework for error characterization of inexact circuits

Justine Bonnot, Vincent Camus, Karol Desnos, Daniel Menard
2019 Microelectronics and reliability  
To design faster and more energy-efficient systems, numerous inexact arithmetic operators have been proposed, generally obtained by modifying the logic structure of conventional circuits.  ...  However, for high bit-widths, the time and memory required for such simulations become prohibitive. To overcome these limitations, a new characterization framework for inexact operators is proposed.  ...  The Inexact Speculative Adder (ISA) [10] is the leading architecture of speculative adders.  ... 
doi:10.1016/j.microrel.2019.02.007 fatcat:3tnvfx23gbhirgli6nbibwedoe

A Retrospective and Prospective View of Approximate Computing [Point of View}

Weiqiang Liu, Fabrizio Lombardi, Michael Shulte
2020 Proceedings of the IEEE  
Both speculative and transistorlevel approximate full adders have been studied.  ...  Speculative adders can be generally grouped into two types: nonsegmented and segmented adders, which generally reduce the carry delay, but do not save significant power.  ... 
doi:10.1109/jproc.2020.2975695 fatcat:y6l6vww5nbgoljxuny3qjugari

Design and FPGA Implementation of High Throughput and Low Latency Machine Learning based Approximate Multiplier for Image Processing Applications

Anil Kumar D.
2022 WSEAS transactions on systems and control  
This research work shows how a 4:2 compressor can be designed using inexact logic minimization and thereby reversing a few bits of the output to ensure efficiency as well as accuracy.  ...  One of the uses of approximate circuits is machine learning (ML) and with the help of inexact logic minimization as well as through probabilistic pruning, these approximate computing circuits can be implemented  ...  efficiency and performance.  ... 
doi:10.37394/23203.2022.17.33 fatcat:oazvrlcknzh7hibb44jlwspo7q

Inexact Decision Circuits: An Application to Hamming Weight Threshold Voting

Bharghava Rajaram, Abinesh Ramachandran, Suresh Purini, Govindarajulu Regeti
2010 2010 23rd International Conference on VLSI Design  
Decision circuits can be tweaked, to perform in an inexact manner, in order to optimize in terms of delay and power, but still maintaining high system accuracy.  ...  The proposed inexact voter consumes up to 8 times less power than the exact voter, with negligible reduction in system accuracy and performance. The leakage power is also reduced by a factor of 3.  ...  The basic Majority Voter is implemented with a tree of full adders as in Fig. 3 .  ... 
doi:10.1109/ dblp:conf/vlsid/RajaramRPR10 fatcat:cja2hgovgjeajbp2be7wj7nfhu

Approximate Computing Circuits for Embedded Tactile Data Processing

Mario Osta, Ali Ibrahim, Maurizio Valle
2022 Electronics  
The results show that energy consumption is reduced by more than five percent with the same accuracy loss.  ...  Improving the performance of the embedded SVM in terms of power, area, and delay can be achieved by implementing approximate multipliers in the SVD.  ...  Acknowledgments: In The authors acknowledge financial support from Tactile feedback enriched virtual interaction through virtual reality and beyond (Tactility) project: EU H2020, Topic ICT-25-2018-2020  ... 
doi:10.3390/electronics11020190 fatcat:6jpnpdzwnnceroyweellbzmwny

Benchmark Tests for Numerical Weather Forecasts on Inexact Hardware

Peter D. Düben, T. N. Palmer
2014 Monthly Weather Review  
Results show that large parts of the model could be integrated with inexact hardware at error rates that are surprisingly high or with reduced precision to only a couple of bits in the significand of floating  ...  Afterward, benchmark simulations were performed for which as many parts of the model as possible were put onto inexact hardware.  ...  Special thanks to Glenn Carver and the ECMWF team for essential help and patience when setting up the single-precision OpenIFS model.  ... 
doi:10.1175/mwr-d-14-00110.1 fatcat:gdy7pamggjhx5ilfvcxg5ma3qq
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