We report here the status of development of our Nb/Al/Nb SNS Josephson junc
tions to be used as superconducting D/A converters. The electrical behaviou
r and the morphology of these Nb/Al/Nb junctions are strongly dependent on
the deposition rate of the AL barrier. Junctions fabricated at a high rate
of 5 nm/s have stable and reproducible properties. A possible interpretatio
n of the effect of the Al morphology on the electrical behaviour of the jun
ctions is given.