Design and Realization of Encoders Based on Switching Circuit

With the rapid development of DNA nanotechnology, a variety of flexible molecular computing models and logic computing systems have been proposed and constructed. Among them, the switching circuit model based on DNA strand displacement technology performs well in terms of the decreased complexity in constructing multi-input and multi-output circuits. However, in the previous established circuits based on the switching computing model, the same switching elements are designed differently to generate diverse target strands for different outputs, increasing the complexity and difficulty of the design. Here, a top-down design strategy is proposed in which only once design is required for each switching element. The presented strategy decreased the amount of switching elements and simplifies the design complexity to a certain extent. To verify the strategy, the 4-2 priority and 10-4 priority encoder is realized by this design and validated by Visual DSD. The proposed method has possibilities in design of large-scale DNA logic computing systems with more inputs and outputs.