New designs in RSFQ logic family

K. K. Likharev, Vasili K. Semenov

Shigeru Yamashita, Katsunori Tanaka, Hideyuki Takada

Naoki Takeuchi, Fumihiro China, Shigehito Miki +4 more

V. K. Kaplunenko, M. Khabipov, V. P. Koshelets +5 more

New elements of the rapid single flux quantum (RSFQ) logic family have been designed, fabricated, and tested. All-Nb 14-layer 5 mu m technology using externally shunted tunnel junctions with j/sub c/=500 A/cm/sup 2/, I/sub c/R/sub s/=300 mu V, and B/sub c/>

Stanislav V. Polonsky

Single flux quantum (SFQ) pulses used by the elements of RSFQ logic/memory family should be transformed into the usual DC-voltage form before leaving an RSFQ chip. To provide a high output voltage level (about the gap voltage V g ) the author suggests an SFQ/DC converter using unshunted hysteresis Josephson junctions. The converter employs a DC flip-flop of a HUFFLE type. It does not require AC power supply and can easily be integrated with the RSFQ elements.