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Numerical Study of the Effect of Parasitic Inductance on RSFQ Circuits

Masaaki MAEZAWA

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Summary :

We have quantitatively and systematically investigated the effect of parasitic inductance on rapid single flux quantum (RSFQ) circuits by numerical simulation. While a parasitic inductance in parallel to a junction has virtually no effect on the circuit performance, a parasitic inductance in series with a junction significantly reduces the operating margins and speeds of circuits that have been optimized with the assumption that no parasitic inductance exists. To improve the reduced margins and speeds we have re-optimized the circuits for operation with parasitic inductance. While the speeds are sufficiently improved by the re-optimization procedure, the margins do not reach those without the parasitics. This suggests that the parasitic inductance shrinks the operating regions of the circuits and improvement of the margins by changing only the values of the parameters is limited. For further improvement of the margins it is important to employ processes and layouts that minimize the series parasitic inductance.

Publication
IEICE TRANSACTIONS on Electronics Vol.E84-C No.1 pp.20-28
Publication Date
2001/01/01
Publicized
Online ISSN
DOI
Type of Manuscript
Special Section PAPER (Special Issue on Superconductive Electronics)
Category
Digital Applications

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