Abstract
In this study we have investigated the influence of an externally applied ground current onlarge-scale single-flux-quantum (SFQ) circuits. A Josephson transmission line containing104 junctions with a total bias current of 1.8 A was examined for this purpose. The test resultsshow that the ground current affects the circuit operation remarkably strongly. In the worstcase, the ground current of about 10 mA for a 5 mm die chip disturbs the circuit operation.The results also show that DC/SFQ and SFQ/DC converters are very sensitive to theground current. To eliminate the effect of the ground current, we have made SFQ circuitscompletely shielded from the external magnetic field by using upper and lower groundplanes. It was found that the shielded SFQ circuits are much less sensitive to the groundcurrent. These results show that the magnetic shielding structure is one solution forreducing the effects of the ground current and hence the external magnetic field.
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