Uroš Lotrič (Author), Ratko Pilipović (Author), Patricio Bulić (Author)

Abstract

Multiplication is an essential image processing operation commonly implemented in hardware DSP cores. To improve DSP cores’ area, speed, or energy efficiency, we can approximate multiplication. We present an approximate multiplier that generates two partial products using hybrid radix-4 and logarithmic encoding of the input operands. It uses the exact radix-4 encoding to generate the partial product from the three most significant bits and the logarithmic approximation with mantissa trimming to approximate the partial product from the remaining least-significant bits. The proposed multiplier fills the gap between highly accurate approximate non-logarithmic multipliers with a complex design and less accurate approximate logarithmic multipliers with a more straightforward design. We evaluated the multiplier’s efficiency in terms of error, energy (power-delay-product) and area utilisation using NanGate 45 nm. The experimental results show that the proposed multiplier exhibits good area utilisation and energy consumption and behaves well in image processing applications.

Keywords

aproksimativni množilnik;aproksimativno računalništvo;načrtovanje aritmetičnih vezij;hibridno kodiranje;radix-4 kodiranje;logaritemsko kodiranje;energijsko učinkovito računanje;approximate multiplier;approximate computing;arithmetic circuit design;hybrid encoding;radix-4 encoding;logarithmic encoding;energy-efficient processing;

Data

Language: English
Year of publishing:
Typology: 1.01 - Original Scientific Article
Organization: UL FRI - Faculty of Computer and Information Science
UDC: 004
COBISS: 63386371 Link will open in a new window
ISSN: 2079-9292
Views: 104
Downloads: 36
Average score: 0 (0 votes)
Metadata: JSON JSON-RDF JSON-LD TURTLE N-TRIPLES XML RDFA MICRODATA DC-XML DC-RDF RDF

Other data

Secondary language: Slovenian
Secondary keywords: aproksimativni množilnik;aproksimativno računalništvo;načrtovanje aritmetičnih vezij;hibridno kodiranje;radix-4 kodiranje;logaritemsko kodiranje;energijsko učinkovito računanje;
Type (COBISS): Article
Pages: str. 1-20
Volume: ǂVol. ǂ10
Issue: ǂno. ǂ10
Chronology: May 2021
DOI: 10.3390/electronics10101175
ID: 14785412