An Efficient Design of DCT Approximation Based on Quantum Dot Cellular Automata (QCA) Technology

Table 1

Comparison of the proposed adder with the previous works.

Circuit	Cell count	Area (μm^2)	Clock no. cycle	Crossover type
Full adder [43]	135	0.14	1.25	Multilayer
Full adder [44]	93	0.087	1	Multilayer
Full adder [45]	73	0.080	0.75	Multilayer
Full adder [46]	220	0.36	3	Coplanar
Full adder [53]	206	0.28	2	Not required
Full adder [47]	102	0.097	2	Coplanar
Full adder [43]	59	0.043	1	Coplanar (clocking based)
Full adder [49]	49	0.04	1	Coplanar (clocking based)
Proposed adder	45	0.04	0.5	Coplanar