Design and operation of distributed double-SQUID amplifier for RSFQ circuits

Recently, many groups have been developing on-chip Rapid Single-Flux-Quantum (RSFQ) output amplifiers which are designed to connect RSFQ circuitry to room temperature electronics. One of such amplifiers is a distributed SQUID amplifier comprising SQUIDs embedded in cascaded RSFQ RS flip-flops. In th...

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Bibliographic Details
Published in:Journal of physics. Conference series 2019-09, Vol.1293 (1), p.12060
Main Authors: Higuchi, Komei, Shimada, Hiroshi, Mizugaki, Yoshinao
Format: Article
Language:English
Subjects:
Amplifier design
Amplifiers
Circuit design
Circuits
Liquid helium
Niobium
Physics
Room temperature
Squid
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Summary:Recently, many groups have been developing on-chip Rapid Single-Flux-Quantum (RSFQ) output amplifiers which are designed to connect RSFQ circuitry to room temperature electronics. One of such amplifiers is a distributed SQUID amplifier comprising SQUIDs embedded in cascaded RSFQ RS flip-flops. In this paper, we propose a distributed double-SQUID amplifier, where a SQUID is replaced with a double-SQUID. Test circuit was fabricated using a niobium integration technology. Measurements were performed in a liquid helium bath. We confirmed that the maximum output voltage swing of a 4-stage distributed double- SQUID amplifier was 2.93 mV, which was comparable with the corresponding numerical value of 3.54 mV.
ISSN:1742-6588
1742-6596
DOI:10.1088/1742-6596/1293/1/012060