Referenced Items are not available for this document.
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.
Published in:
Applied Superconductivity, IEEE Transactions on
(Volume:7
,
Issue:
3
)
Date of Publication: Sept. 1997
- Page(s):
- 3808 - 3811
- ISSN :
- 1051-8223
- INSPEC Accession Number:
- 5702342
- Digital Object Identifier :
- 10.1109/77.622979
- Product Type:
- Journals & Magazines
- Date of Current Version :
- 06 August 2002
- Issue Date :
- Sept. 1997
- Sponsored by :
- The IEEE Council on Superconductivity
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