Digital filters built of locally connected nanoelectronic devices

This paper presents an architecture of digital wave filters for processing bit-stream signals with nanoelectronic devices. We use three kinds of circuit modules for the filters. One of the modules is an integer delay built of unit delay cells connected in series. The rest of the modules are two types of adders based on bit-sorting networks which are built by connecting ANDOR gate pair cells regularly and locally. Using only the three modules we construct bandpass and band-elimination digital wave filters in which the circuit cells are connected locally. This local-connection architecture helps to surmount some difficulties in applying nanoelectronic devices. We designed a building block for the filters with quantum-dot cellular automata (QCA) and simulated its filtering operation. The simulation results show that the filter responds as we theoretically estimated.