UNIFORM Ti-BARRIER JOSEPHSON JUNCTION ARRAYS FOR AC JOSEPHSON VOLTAGE STANDARD.
Using this new process we recently fabricated arrays of single (unstacked) Nb-Ti-Nb junctions in microwave circuits designed for arbitrary waveform synthesis. These junction arrays are embedded in microwave circuits, which are used to evaluate the junction uniformity. We successfully generated constant-voltage steps in 1000- and 4100-junction series arrays. This is a very good result because it shows that the correct voltage is generated over significant current range for a broad range of frequencies for this large 4100-junction array. This indicates good junction uniformity as well as good microwave uniformity for the entire circuit design. Most of the structure in this circuit is caused by filter resonances], which are also under development. Stacked 2-junction pentalayer arrays are under development.
|Printer friendly Cite/link Email Feedback|
|Publication:||Journal of Research of the National Institute of Standards and Technology|
|Article Type:||Brief Article|
|Date:||Jul 1, 2001|
|Previous Article:||SEVEN-TIMES RESOLUTION IMPROVEMENT IN NARROWBAND POLARIZATION-MODE DISPERSION.|
|Next Article:||RESONATING TORQUE MICROBALANCE DEVELOPED FOR IN SITU MEASUREMENTS OF FERROMAGNETIC FILMS WITH SUB-MONOLAYER SENSTIVITY.|