Design of delta-sigma feedback loop for quantum voltage digitizer

CPEM 2016 Conference Digest, Ottawa, Canada, July 2016, DOI 10.1109/CPEM.2016.7540457
Jane Ireland, Alice Cryer, Jonathan M. Williams, Ernest Houtzager, Ralph Hornecker, and Helko E. van den Brom.

Abstract
A system utilizing a delta-sigma (DS) feedback loop to digitize an arbitrary voltage waveform in terms of the quantum-accurate output of a Josephson junction array (JJA) has been designed. Using commercially available components, a first order DS loop has been constructed and tested with direct feedback. At a sample rate of 20 MHz a signal to noise ratio of <; 104 was demonstrated.

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