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Nowadays exponential advancement in reversible comp
utation has lead to better fabrication and
integration process. It has become very popular ove
r the last few years since reversible logic circuit
s
dramatically reduce energy loss. It consumes less p
ower by recovering bit loss from its unique inputo
utput
mapping. This paper presents two new gates called
RCI and RCII to design an nbit signed binary
comparator where simulation results show that the p
roposed circuit works correctly and gives significa
ntly
better performance than the existing counterparts.
An algorithm has been presented in this paper for
constructing an optimized reversible nbit signed c
omparator circuit. Moreover some lower bounds have
been proposed on the quantum cost, the numbers of g
ates used and the number of garbage outputs
generated for designing a low cost reversible sign
ed comparator. The comparative study shows that the
proposed design exhibits superior performance consi
dering all the efficiency parameters of reversible
logic
design which includes number of gates used, quantum
cost, garbage output and constant inputs. This
proposed design has certainly outperformed all the
other existing approaches.
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