Wideband digital modular system for dynamic characterization of PJVS

This work deals with the use of high precision digital modular systems, employed towards a wideband chassis, for use with PJVS devices. A key feature of digital modular systems lies on their fast software reconfigurability, exploited to better adapt characteristics as well as performances of different boards (e.g., DACs, ADCs, timing and synchronization) to a specific experimental setup. A compact and modular wideband measurement system suitable to interact dynamically with series array of Josephson junctions is developed. Synchronous digital modules for digital synthesis of isofrequential LF triangular and RF rectangular patterns and precise sampling are used for realtime characterization of sections of a PJVS chip, which operates in a two-stage (4 K) cryocooler system. A suitable synchronous program has been developed and new algorithms are being tested for synthesis of arbitrary LF quantum waveforms, that will be used for direct traceability of digital systems.