Abstract
The application of superconducting rapid single-flux quantum (RSFQ) digitalelectronics for highly sensitive measurement of magnetic fields can provide significantadvantages in the use of conventional analogue SQUIDs, especially in terms ofoperation speed and dynamic range. Furthermore, utilizing an unconventionalgeneralized single-flux-quantum (SFQ) logic with a bidirectional operation principleallows an additional decrease in effort in superconducting electronics. Our novelfully digital SQUID based on the SFQ technique can be assumed to be operatingat frequencies in the gigahertz range corresponding to slew rates of several109 Φ0 s−1. We present first experimental results for the proper digital function as a preliminary stagefor a digital SQUID magnetometer device. The measurements presented are performed fora reliable low temperature superconductor technology at liquid helium temperature;nevertheless the very low complexity of the superconducting digital circuitry holds promiseas regards prospects for a working digital SQUID based on high temperaturesuperconductor technology.
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