Mr. Adrián Estrada Profile

Adrián Estrada

at Ctr Nacional de Microelectrónica

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Proceedings Article | 10 May 2007 Paper

Partitioning and characterization of high speed adder structures in deep-submicron technologies

Adrián Estrada, Gashaw Sassaw, Carlos Jiménez, Manuel Valencia

Proceedings Volume 6590, 659004 (2007) https://doi.org/10.1117/12.721996

KEYWORDS: Multiplexers, Binary data, Manufacturing, Structural design, Very large scale integration, Microelectronics

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The availability of higher performance (in area, time and power consumption) and greater precision binary adders is a constant requirement in digital systems. Consequently, the design and characterization of adders and, most of all, their adaptation to the requisites of present-day deep-submicron technologies, are today still issues of concern. The binary adder structures in deep-submicron technologies must be revised to achieve the best balance between the number of bits in the adder and its delay, area and power consumption. It is therefore very important to make an effort to carefully optimize adder structures, thus obtaining improvements in digital systems. This communication presents the optimization of adder structures for implementations in deep-submicron technologies through their partitioning into blocks. This partitioning consists of dividing the number of input bits to the adder into several subsets of bits that will constitute the inputs to several adder structures of the same or of different types. The structures used to accomplish this study range from the more traditional types, such as the carry look ahead adder, the ripple carry adder or the carry select adder, to more innovative kinds, like the parallel prefix adders of the type proposed by Brent-Kung, Han-Carlson, Kogge-Stone or Ladner-Fischer. The analyses carried out allow the characterization of structures implemented in deep-submicron technologies for area, delay and power consumption parameters.

Proceedings Article | 30 June 2005 Paper

A methodology for the characterization of arithmetic circuits on CMOS deep submicron technologies

Adrian Estrada, Carlos Jimenez, Manuel Valencia

Proceedings Volume 5837, (2005) https://doi.org/10.1117/12.608816

KEYWORDS: Computer aided design, Digital electronics, Logic, CMOS technology, Switches, Signal processing, Metals, Computer simulations, Integrated circuits, Integrated circuit design

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Integration technologies have favored the design and implementation of more complex circuits. Thanks to this increased complexity, these circuits are capable of implementing algorithms which a few years ago were too expensive in both area and computational resources. However, they now offer interesting choices which should be considered. This new generation of integrated circuits nevertheless presents other kinds of restrictions that the designer should bear in mind. Parameters such as frequency of operation or power consumption are new restrictions that the designer has to deal with in order to fulfill the conditions established by the circuit functionality. Finally, the shrinking integration scale of current technologies makes the timing behavior of the design differ from previous technologies. Thus, a review of the timing behavior of the digital circuit should be done. So far, arithmetic circuits have been used as a benchmark for the analysis and design procedures of digital circuits. Therefore, it is our goal now to analyze both conventional and modern arithmetic circuits structures for different deep-submicron technologies. To achieve this goal, a good solution is to characterize a set of algorithmic circuits for several deep submicron processes, so that the designer can select the most suitable one depending upon the intended application and existing restrictions. In this paper, the first steps to attain such selection are presented. In particular, we propose a design and VHDL characterization methodology based on an RTL description of each component, on the utilization of an automated synthesis tool, and on the generation of logic characteristics from the logic level. This methodology is applied to a set of adders structures, the results of which are also presented.

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