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NbN and Nb SFQ device performance

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4 Author(s)
Johnson, M.W. ; Space & Electron., TRW Inc., Redondo Beach, CA, USA ; Dalrymple, B.J. ; Durand, D.J. ; Luine, Jerome A.

The static frequency divider is commonly used as a performance benchmark for both superconductor and semiconductor digital device technologies. We present results of a static divide-by-two circuit, an NbN (1 kA/cm2) SFQ T-flip-flop (TFF) operating to 97 GHz. Details of the measurement and operating criterion are discussed. Measurements of junction capacitance, a particularly important factor effecting device performance, are presented for TRW's NbN process. Simulations of expected device performance are shown to explain measured performance reasonably well. NbN results are presented alongside a those of a recent 8kA/cm2 Nb divider operating at 300 GHz, as well as published Nb TFF results.

Published in:

Applied Superconductivity, IEEE Transactions on  (Volume:13 ,  Issue: 2 )