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Timing circuits for RSFQ digital systems

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2 Author(s)
Jao-Ching Lin ; Dept. of Electr. Eng., State Univ. of New York, Stony Brook, NY, USA ; Semenov, V.K.

A low-skew frequency divider and clock controller have been designed for high-frequency timing of superconductor rapid single-flux-quantum (RSFQ) digital systems. The circuits have only about 10-ps skew between input and output signals and are applicable for multirate digital systems (e,g., oversampling analog-to-digital converter and bit-serial digital systems). Several circuits have been fabricated in conventional Nb-trilayer technology with a critical current density of 1 kA/cm/sup 2/. The most complex clock controller generates trains of 2/sup 24/ single-flux-quantum pulses with a period of less than 70 ps. The long-term relative stability of these intervals has been measured to be better than 6/spl times/10/sup -5/. The basic component of the controller, a frequency divider, operates at input frequencies above 85 GHz.<>

Published in:

Applied Superconductivity, IEEE Transactions on  (Volume:5 ,  Issue: 3 )

Date of Publication:

Sept. 1995

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