Majority Gate-Based Feedback Latches for Adiabatic Quantum Flux Parametron Logic

Naoki TSUJI  Naoki TAKEUCHI  Yuki YAMANASHI  Thomas ORTLEPP  Nobuyuki YOSHIKAWA  

Publication
IEICE TRANSACTIONS on Electronics   Vol.E99-C   No.6   pp.710-716
Publication Date: 2016/06/01
Online ISSN: 1745-1353
DOI: 10.1587/transele.E99.C.710
Type of Manuscript: Special Section PAPER (Special Section on Cutting-Edge Technologies of Superconducting Electronics)
Category: 
Keyword: 
AQFP,  superconducting circuits,  Josephson integrated circuits,  adiabatic logic,  latch,  

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Summary: 
We have studied ultra-low-power superconductor circuits using adiabatic quantum flux parametron (AQFP) logic. Latches, which store logic data in logic circuits, are indispensable logic elements in the realization of AQFP computing systems. Among them, feedback latches, which hold data by using a feedback loop, have advantages in terms of their wide operation margins and high stability. Their drawbacks are their large junction counts and long latency. In this paper, we propose a majority gate-based feedback latch for AQFP logic with a reduced number of junctions. We designed and fabricated the proposed AQFP latches using a standard National Institute of Advanced Industrial Science and Technology (AIST) process. The measurement results showed that the feedback latches operate with wide operation margins that are comparable with circuit simulation results.