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Linewidth measurements and phase locking of Josephson oscillators using RSFQ circuits

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4 Author(s)
Dubash, N.B. ; Conductus Inc., Sunnyvale, CA, USA ; Yongming Zhang ; Ghoshal, U. ; Perng-Fei Yuh

We present a technique for linewidth measurement and phase-locking of Josephson oscillators using digital rapid single-flux-quantum (RSFQ) circuits. The oscillator consists of a resistively shunted 6 /spl mu/m/spl times/6 /spl mu/m Nb/AlO/sub x//Nb Josephson tunnel junction that is integrated with RSFQ input and output circuits. A cascade of RSFQ T flip-flops is used to directly monitor the output of the Josephson oscillator. Spectral characteristics have been measured directly for oscillator frequencies ranging from 10-50 GHz. The linewidth can be reduced by over 100 times by phase-locking the oscillator to an RSFQ pulse train generated by an external sinusoidal signal. These Josephson oscillators can be used as on-chip stable high frequency clocks for RSFQ circuits.

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Applied Superconductivity, IEEE Transactions on  (Volume:7 ,  Issue: 3 )