Title :
Switching delay of a nonlatching Josephson gate evaluated from ring oscillator operation
Author :
Mizugaki, Y. ; Nakajima, K. ; Shoji, A.
Author_Institution :
Res. Inst. of Electr. Commun., Tohoku Univ., Sendai, Japan
Abstract :
The authors present the experimental results for the switching delay of a dc-biased nonlatching Josephson gate (a coupled-superconducting quantum interference device gate). The measurement is executed by the use of a ring oscillator (RO) method. A frequency-to-voltage converter is used to evaluate the oscillation frequency of the RO. The circuit is designed and fabricated using a 2.5-kA/cm/sup 2/ Nb/AlO/sub x//Nb Josephson junction technology. The results show the minimum switching delay of 18 ps.
Keywords :
SQUIDs; delays; logic testing; superconducting device testing; superconducting logic circuits; voltage-frequency convertors; DC bias; Nb-AlO-Nb; Nb/AlO/sub x//Nb Josephson junction; circuit testing; coupled-SQUID gate; frequency-to-voltage converter; nonlatching Josephson gate; ring oscillator; switching delay; Circuit simulation; Circuit testing; Coupling circuits; Delay; Frequency conversion; Interference; Josephson junctions; Niobium; Ring oscillators; Voltage;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
