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Summary: A Universal Gate for Combinational Design of QCA Circuits
Young Bok Kim, Yong-Bin Kim, and F. Lombardi
Dept of Electrical and Computer Engineering
Northeastern University
Boston, USA
{youngbok,ybk,lombardi}@ece.neu.edu
Abstract-- As an emerging technology, Quantum-dot Cellular
Automata (QCA) has been extensively analyzed in the technical
literature for implementing logic circuits; in this technology, the
basic combinational circuit is the majority voter with three
inputs. In this paper, the design of a logic gate which implements
any combinational function of at most three input variables is
presented. This type of gate is generally referred to as a universal
gate and is often used as logic resource in array structures such
as FPGAs. This paper investigates a logic characterization of the
universal gate using two different techniques found in the
technical literature: AND/OR-based synthesis and MV-based
synthesis. Important design features of the gate (such as the
utilization of the majority voting function or MV and inverters)
and design issues revolving around signal routing of the input
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