SFQ Bias for SFQ Digital Circuits

نویسندگان

چکیده

Superconductor electronics fabrication technology developed at MIT Lincoln Laboratory enables the development of VLSI digital circuits with millions Josephson junctions per square centimeter. However, conventional DC and multi-phase AC biasing techniques already encounter serious challenges for scaling above several hundred thousand junctions. In this work, we propose a novel AC-based scheme RSFQ-type logic families requiring bias. The major step toward is superconducting AC/DC rectifier which introduced ASC 2014. Initially, proposed to connect rectifiers 'payload cells' via inductors large inductance in order reduce parasitic effects flux quantization. Recently, discovered that powering works even better much lower value inductance, when it just sufficient hold only one or two quanta inductive loop between converter payload. case, quantization becomes beneficial because current fed into payload defined by coupling inductance. Therefore, our AC/SFQ powers cell single quantum rather than current. Such mode operation extremely energy efficient used recover consumed during operation. We present designs converters comprising an conditioning circuit termed SFQ filter. also test results demonstrate using fabricated new, 150-nm node self-shunted Nb/AlOx-Al/Nb 600 $\mu$A/$\mu$$m^2$ critical density 200 nm minimum linewidth inductors.

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ژورنال

عنوان ژورنال: IEEE Transactions on Applied Superconductivity

سال: 2021

ISSN: ['1558-2515', '1051-8223']

DOI: https://doi.org/10.1109/tasc.2021.3067231