Development of SFQ Logic Gates Connectable to Passive Transmission Lines and Their Application to Digital Signal Processors

单磁通量子(SFQ)集成电路将SFQ电路与无损超导无源传输线(PTL)相结合，具有极高的速度和低功耗能力。本文研究了一种将SFQ逻辑门与PTLS直接连接的技术，并开发了一种新的单元库。结果表明，该技术大大减少了SFQ电路的结点数和功耗。基于该技术还开发了FFT信号处理器，并对其高速运算进行了演示。

Single-flux-quantum (SFQ) integrated circuits, which combine SFQ circuits with loss-less superconducting passive transmission lines (PTLs), have extremely high-speed and low-power abilities. In this study, a technique to connect SFQ logic gates directly with PTLs was studied and a new cell library was developed. It was demonstrated that the junction number and power consumption of SFQ circuits were considerably reduced with this technique. FFT signal processors were also developed based on this technique for their digital-signal-processor application, and their high-speed operation was demonstrated.