Design of delta-sigma feedback loop for quantum voltage digitizer

Jane Ireland,Alice Cryer,Jonathan M. Williams,Ernest Houtzager,Ralph Hornecker,Helko E. van den Brom

2016 Conference on Precision Electromagnetic Measurements (CPEM 2016)（2016）

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摘要

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 <; 10 ⁴ was demonstrated.

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关键词

Delta-sigma modulation,Josephson junctions,measurement,metrology,voltage measurement

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