Abstract
A good deal of ingenuity can be exercised and a vast amount of time wasted exploring layout topologies to minimize the size of a gate or other circuitry such as an adder or memory element in an integrated circuit. This paper represents a simple and compact layout design for two bit binary parallel ripple carry adder using only CMOS NAND gates with the help of Microwind as a tool for design and simulation. Construction of this adder for fabricating involves the design of 2-input, 3-input, 4-input NAND gates and CMOS NAND inverters. The performance parameters are analyzed from the simulation responses and characteristics curves of the proposed design. The optimization of the design towards single P+ or N+ diffusion, single +Vdd and single Vdd supply contributed to lesser area and improved functionality of the adder circuits performance.DOI: http://dx.doi.org/10.3329/dujs.v60i1.10346 Dhaka Univ. J. Sci. 60(1): 103-108 2012 (January)
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