Abstract
Superconductor/normal conductor/superconductor (SNS) Josephson junction series arraysare the subject of research for the realization of a Josephson arbitrary waveform synthesizer(JAWS) based on pulse-driven Josephson junctions. Lumped arrays of SNS Josephsonjunctions are investigated for this application at the Physikalisch-Technische Bundesanstalt(PTB). The series arrays consisting of Nb/HfTi/Nb SNS junctions are embedded in thecenter line of a coplanar waveguide transmission line. To increase the ac outputvoltage, the Josephson junction series array is designed as a meander-like structure.A broadband response of the arrays is required for the complex pulse operation of theJAWS. The arrays are investigated by dc measurements and for test purposes undercontinuous microwave irradiation at different frequencies. Flat Shapiro steps weremeasured for meander-like series arrays with 21 parallel lines containing up to10 752 junctions. A sine wave with a frequency of 2.5 kHz and a peak voltage of214 mVPeak was synthesized under pulse mode operation.
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