Implementation of Interface Circuit for Digital SQUID with Sub-Flux Quantum Feedback Resolution

Digital SQUIDs with single flux quantum (SFQ) feedback have attracted much attention because of the feasibility of realizing a wide dynamic range and high slew rate for digital magnetometers. To achieve a higher resolution, we studied a digital SQUID with sub-flux quantum feedback. We studied implem...

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Bibliographic Details
Published inJournal of physics. Conference series Vol. 1590; no. 1; pp. 12039 - 12044
Main Authors Matsunawa, Ryo, Itagaki, Kohki, Oshima, Itta, Hasegawa, Yuichi, Naruse, Masato, Taino, Tohru, Myoren, Hiroaki
Format Journal Article
LanguageEnglish
Published Bristol IOP Publishing 01.07.2020
Subjects
Bias
Circuits
Feedback
Physics
Power consumption
Signal processing
Slew rate
Superconducting quantum interference devices
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Summary:Digital SQUIDs with single flux quantum (SFQ) feedback have attracted much attention because of the feasibility of realizing a wide dynamic range and high slew rate for digital magnetometers. To achieve a higher resolution, we studied a digital SQUID with sub-flux quantum feedback. We studied implementation methods for an interface circuit by considering the circuit size, power consumption and signal processing to achieve high-resolution and highspeed operation of the digital SQUID magnetometer. Assuming the decimation filter and the up/down counter implemented on a FPGA board, a 1-bit to 16-bit deserializer with an output frequency of 500 MHz could be used for the interface circuit. The circuit scale was 1940 µm × 1720 µm, and the bias current was 302 mA. From the simulation results, a sufficient wide bias margin could be obtained up to 30 GHz.
ISSN:1742-6588
1742-6596
DOI:10.1088/1742-6596/1590/1/012039