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TitleA Josephson-array calculable-waveform generator
Publication TypeJournal Article
Year of Publication1998
AuthorsChristian, L.A., and Millar K.J.H.
JournalIEEE Transactions on Instrumentation and Measurement
Pagination469 - 475
Date Published1998
ISSN00189456 (ISSN)
Keywordscomputer simulation, Digital to analog conversion, Electric variables measurement, Josephson junction devices, Josephson-array calculable waveform generators, Microwave devices, Modulation, Numerical analysis, Signal generators
AbstractThis paper proposes a new method for using a Josephson array to create a voltage waveform with a root-mean-square value calculable to better than 2 in 106 at frequencies below 50 Hz. A novel method of reliably switching the dc voltage from one known voltage step to another at precisely defined time intervals is investigated. In this method, transients in the microwave voltage driving the array are used to induce switching between steps. We consider two possible implementations of this concept. The first is for an array similar to that used in conventional dc voltage standards. The second uses the binary sequence of individually biased arrays introduced by Hamilton et al. Computer simulation and theoretical analysis is used to demonstrate that the uncertainties in switching times are potentially limited only by the speed of the available microwave attenuators, which is currently of the order of a nanosecond. © 1998 IEEE.

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