Detail publikace

Automatic Design of Low-Power VLSI Circuits: Accurate and Approximate Multipliers

MRÁZEK, V. VAŠÍČEK, Z.

Originální název

Automatic Design of Low-Power VLSI Circuits: Accurate and Approximate Multipliers

Typ

článek ve sborníku ve WoS nebo Scopus

Jazyk

angličtina

Originální abstrakt

In order to satisfy a constant need of reducing energy consumption of electronic devices, the approximate computing paradigm has been introduced in recent years. This paradigm is based on the fact that there are applications that are inherently capable of absorbing some errors in computation. Multimedia signal processing represents a typical example that allows for quality to be traded off for power. Typically, the approximate circuits are designed at gate level. This paper introduces an automatic design method that is able to operate directly at transistor level which offers a great potential for discovering novel implementations of approximate circuits. The method combines a stochastic search algorithm with transistor-level circuit simulator and is able to handle the circuits consisting of hundreds of transistors. The goal of the search strategy is to improve the power consumption. To estimate power consumption, an algorithm based on transistor switching activity is proposed. A design of 4-bit multiplier was chosen as a case study. Two scenarios were considered. Firstly, the proposed method is applied to improve the power consumption of a common 4-bit multiplier and a 4-bit multiplier consisting of manually designed 2-bit multipliers. In both cases, approx. 3% power reduction was achieved. Then, it is demonstrated that a noticeable improvement can be obtained when the multipliers are designed using a hybrid approach operating at transistor as well as gate level. We discovered a novel implementation of an approximate 4-bit multiplier which has approximately by 40% better powerdelay product and exhibits 14% lower worst-case error compared to the best known 4-bit multiplier consisting of 2-bit manually optimized approximate multipliers

Klíčová slova

Evolutionary optimization, transistor level, low power, approximate computing, multiplier

Autoři

MRÁZEK, V.; VAŠÍČEK, Z.

Rok RIV

2015

Vydáno

8. 3. 2015

Nakladatel

Institute of Electrical and Electronics Engineers

Místo

Porto

ISBN

978-1-4673-8299-1

Kniha

Proceedings of 13th IEEE/IFIP International Conference on Embedded and Ubiquitous Computing

Strany od

106

Strany do

113

Strany počet

6

URL

http://dx.doi.org/10.1109/EUC.2015.20

BibTex

@inproceedings{BUT119830,
  author="Vojtěch {Mrázek} and Zdeněk {Vašíček}",
  title="Automatic Design of Low-Power VLSI Circuits: Accurate and Approximate Multipliers",
  booktitle="Proceedings of 13th IEEE/IFIP International Conference on Embedded and Ubiquitous Computing",
  year="2015",
  pages="106--113",
  publisher="Institute of Electrical and Electronics Engineers",
  address="Porto",
  doi="10.1109/EUC.2015.20",
  isbn="978-1-4673-8299-1",
  url="http://dx.doi.org/10.1109/EUC.2015.20"
}