Quantum-dot cellular automata (QCA) technology has been widely considered as an alternative to complementary metal-oxide-semiconductor (CMOS) due to QCA's inherent merits.Many interesting QCA-based logic circuits ...Quantum-dot cellular automata (QCA) technology has been widely considered as an alternative to complementary metal-oxide-semiconductor (CMOS) due to QCA's inherent merits.Many interesting QCA-based logic circuits with smaller feature size,higher operating frequency,and lower power consumption than CMOS have been presented.However,QCA is limited in its sequential circuit design with high performance flip-flops.Based on a brief introduction of QCA and dual-edge triggered (DET) flip-flop,we propose two original QCA-based D and JK DET flip-flops,offering the same data throughput of corresponding single-edge triggered (SET) flip-flops at half the clock pulse frequency.The logic functionality of the two proposed flip-flops is verified with the QCADesigner tool.All the proposed QCA-based DET flip-flops show higher performance than their SET counterparts in terms of data throughput.Furthermore,compared with a previous DET D flip-flop,the number of cells,covered area,and time delay of the proposed DET D flip-flop are reduced by 20.5%,23.5%,and 25%,respectively.By using a lower clock pulse frequency,the proposed DET flip-flops are promising for constructing QCA sequential circuits and systems with high performance.展开更多
By mapping a fixed polarity Reed-Muller (RM) expression into an onset table and studying the properties of the onset table,an algorithm is proposed to obtain a compact multi-level single-output mixed-polarity RM funct...By mapping a fixed polarity Reed-Muller (RM) expression into an onset table and studying the properties of the onset table,an algorithm is proposed to obtain a compact multi-level single-output mixed-polarity RM function by searching for and extracting the common variables using the onset table.Furthermore,by employing the multiplexer model,the algorithm is extended to optimize multi-level multi-output mixed-polarity RM forms.The proposed algorithm is implemented in C language and tested using some MCNC benchmarks.Experimental results show that the proposed algorithm can obtain a more compact RM form than that under fixed polarity.Compared with published results,the proposed algorithm makes a significant speed improvement,with a small increase in the number of literals.展开更多
基金Project (No.Y1110808) supported by the Natural Science Foundation of Zhejiang Province,China
文摘Quantum-dot cellular automata (QCA) technology has been widely considered as an alternative to complementary metal-oxide-semiconductor (CMOS) due to QCA's inherent merits.Many interesting QCA-based logic circuits with smaller feature size,higher operating frequency,and lower power consumption than CMOS have been presented.However,QCA is limited in its sequential circuit design with high performance flip-flops.Based on a brief introduction of QCA and dual-edge triggered (DET) flip-flop,we propose two original QCA-based D and JK DET flip-flops,offering the same data throughput of corresponding single-edge triggered (SET) flip-flops at half the clock pulse frequency.The logic functionality of the two proposed flip-flops is verified with the QCADesigner tool.All the proposed QCA-based DET flip-flops show higher performance than their SET counterparts in terms of data throughput.Furthermore,compared with a previous DET D flip-flop,the number of cells,covered area,and time delay of the proposed DET D flip-flop are reduced by 20.5%,23.5%,and 25%,respectively.By using a lower clock pulse frequency,the proposed DET flip-flops are promising for constructing QCA sequential circuits and systems with high performance.
基金Project supported by the National Natural Science Foundation of China (Nos.60871022 and 61041001)the Natural Science Foundation of Zhejiang Province (Nos.Z1090622 and Y1080654)the Ningbo Natural Science Foundation,China (No.2010A610183)
文摘By mapping a fixed polarity Reed-Muller (RM) expression into an onset table and studying the properties of the onset table,an algorithm is proposed to obtain a compact multi-level single-output mixed-polarity RM function by searching for and extracting the common variables using the onset table.Furthermore,by employing the multiplexer model,the algorithm is extended to optimize multi-level multi-output mixed-polarity RM forms.The proposed algorithm is implemented in C language and tested using some MCNC benchmarks.Experimental results show that the proposed algorithm can obtain a more compact RM form than that under fixed polarity.Compared with published results,the proposed algorithm makes a significant speed improvement,with a small increase in the number of literals.
