Title :
Multi-gigahertz operation of 3-junction-interferometer-based Josephson latching logic circuits
Author :
Hioe, W. ; Hosoya, M. ; Kominami, S. ; Nagaishi, H. ; Nishino, T.
Author_Institution :
Central Res. Lab., Hitachi Ltd., Tokyo, Japan
fDate :
6/1/1997 12:00:00 AM
Abstract :
Josephson latching logic gates require an ac power supply for correct operation. Owing to the difficulty in fabricating Josephson regulators for large power currents, multi-phase sinusoidal power supply is the preferred method for multi-gigahertz operation. However, the inherently variable ac power reduces device margin for covering process variations. As a result, there exists a strong relationship between circuit size, maximum operating frequency and circuit throughput for a given available margin. The trade-offs between these performance criteria are analyzed for 3-junction-interferometer-based logic gates. Experimental evaluation of the multi-gigahertz operation of small circuits showed that careful design of power supply networks that reduce power supply fluctuations will be needed to maximize performance. Simulation and experimental results are discussed.
Keywords :
circuit analysis computing; integrated circuit design; logic gates; power supply circuits; superconducting logic circuits; switching networks; 1 to 3.3 GHz; 3-junction-interferometer-based Josephson latching logic circuits; Josephson latching logic gates; Josephson regulators; ac power supply; circuit size; circuit throughput; maximum operating frequency; multi-gigahertz operation; multi-phase sinusoidal power supply; power supply fluctuation reduction; power supply network design; simulation; switching network; transmission line effects; very fast signal processing; Circuits; Fluctuations; Frequency; Josephson junctions; Logic devices; Logic gates; Performance analysis; Power supplies; Regulators; Throughput;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
