Abstract
We have designed and developed superconducting single flux quantum (SFQ) digital signal processing circuits using the residue number system (RNS). RNS arithmetic is a complete alternative to binary arithmetic for performing digital computations, which appears to have many advantages for SFQ circuits. We present a scheme for performing all RNS arithmetic functions using Josephson shift registers alone, and suggest that this Is advantageous for high-temperature superconductor computational circuits. We have designed a one-decimal-digit adder, realized with Nb-based superconducting circuitry. Its most complex component, the mod5 adder, has been simulated to show perfect functionality and subcell simulated margins are compared with the experimental results. >
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