Efficient Designs of Reversible Synchronous Counters in Nanoscale

摘要

In recent years, reversible circuits have attracted the attention of many researchers. Their applications include the design of low-power digital circuits, the design of computational circuits in quantum computers and DNA-based calculations. In this paper, an effective 5 x 5 reversible block, called new block (NB), is first proposed, and then, using the proposed reversible block, a novel reversible T flip-flop is designed. Moreover, we have used Miller synthesis method for calculating the optimal quantum cost of the proposed block. Finally, using the proposed T flip-flop, Feynman gate (FG), Fredkin gate (FRG), Reversible Multiplexer1 (RMUX1) and Modified Toffoli gate (MTG), two reversible synchronous counters including up/down and BCD are suggested. The comparison results show that the proposed up/down counters are superior to the previous designs in terms of parameters such as gate count, constant input, garbage output, quantum cost, and delay.