Measurement of jitter in a long Josephson junction soliton oscillator clock source

Citation
Jl. Habif et al., Measurement of jitter in a long Josephson junction soliton oscillator clock source, IEEE APPL S, 11(1), 2001, pp. 1086-1089
Citations number
5
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science
Journal title
IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY
ISSN journal
10518223 → ACNP
Volume
11
Issue
1
Year of publication
2001
Part
1
Pages
1086 - 1089
Database
ISI
SICI code
1051-8223(200103)11:1<1086:MOJIAL>2.0.ZU;2-P
Abstract
Stability of Josephson junction clock sources can be a limiting factor in t he operation of RSFQ digital and mixed signal circuits. We have developed t echniques for the characterization of the short-term stability, i.e., the j itter, of Josephson junction clock sources, and in this paper we present me asurements of the jitter for a long Josephson junction soliton oscillator c lock. The output frequency of the soliton oscillator was prescaled by using a chain of T flip-flops and using a current bias feedback the oscillator w as phase locked to a stable room temperature RF source. Phase noise spectra of the clock signal were measured at the successive stages of the T flip-f lop chain and interpreted to infer the cycle-to-cycle jitter of the soliton oscillator. The jitter at the output of the soliton oscillator was measure d to be 60 fs at a frequency of 26 GHz, or 0.16% of the period of the clock .