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We are developing a high-speed FFT processor using single- flux-quantum (SFQ) logic circuits. In our previous studies we have designed and demonstrated a 4-bit butterfly processor using the AIST 10 kA/cm<sup>2</sup> Nb Advanced Process 2 (ADP2) at the frequency of 51.6 GHz, which is the main circuit of the FFT processor. In this study, we investigated the architecture of the SFQ FFT processor...
As continuous process scaling produces large-scale chips, small-delay defects become one of the major chip-reliability limiters. Small-delay defect detection techniques for LSI screening have been developed, which can successfully detect outlier chips among normally-distributed chips in a short testing time. In our experiments with 90 nm CMOS 100 MHz test chips, we have successfully detected around...
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