Title :
Fabrication and logic operation of oxide SFQ-circuit-components
Author :
Tarutani, Yoshinobu ; Ishimaru, Yoshihiro ; Wakana, Hironori ; Adachi, Seiji ; Nakayama, Kouhei ; Oshikubo, Yasuo ; Horibe, Osami ; Morimoto, Yusuke ; Tanabe, Kazuki
Author_Institution :
Supercond. Res. Lab., Tokyo, Japan
fDate :
6/1/2005 12:00:00 AM
Abstract :
Basic SFQ circuit components, such as SFQ-dc converter, set-reset flip-flop (RS-FF), confluence buffer and splitter, have been fabricated by the YBa2Cu3O7-x-ramp-edge-junction technology and their logic operations were investigated. Circuit parameters were optimized in order to widen the margins of these oxide SFQ circuit components. The SFQ-dc converter that comprised double SQUIDs connected in series showed the output voltage as much as 0.3 mV at 22 K owing to high IcRn value of the ramp-edge junction. Logic operations of the RS-FF, the confluence buffer and the splitter were correctly performed by using the SFQ-dc converter. Finite operating margins were obtainable for these circuits up to the temperature near 30 K.
Keywords :
SQUIDs; barium compounds; convertors; flip-flops; superconducting logic circuits; yttrium compounds; 0.3 mV; 22 K; RS flip-flop; SFQ circuit components; SFQ-dc converter; YBa2Cu3O7-x; YBa2Cu3O7-x-ramp-edge-junction technology; circuit parameters; confluence buffer; confluence splitter; double SQUIDs; finite operating margins; logic operation; output voltage; oxide SFQ-circuit-components; ramp-edge junction; set-reset flip-flop; Counting circuits; Electrodes; Fabrication; Flip-flops; Frequency estimation; Josephson junctions; Logic circuits; SQUIDs; Superconducting transmission lines; Voltage; Confluence buffer; RS flip-flop; SFQ-dc converter; oxide SFQ circuit; splitter;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
DOI :
10.1109/TASC.2005.849854
