Abstract
A modified variable-threshold logic (MVTL) gate for use in Josephson LSI circuits is considered. A 7.6 K-gate Josephison macrocell array whose functions can be changed by wiring changing has been developed. Automatic design problems, such as AC powering and small fan-outs, are solved by constructing the macrocell with a three-phase powering system and developing a magnetically coupled unit cell. The chip contains 21440 Josephson junctions on a 5 mm*5 mm die and is fabricated using 1.5 mu m all-niobium Josephson techniques. An average delay of 5.3 ps/gate in the macrocell and a total chip power consumption of 23 mW have been obtained. >
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