| Presentation | 2018-01-31 Design of Digital Filter for Digital SQUID with sub-Flux Quantum Feedback Resolution Ryo Matsunawa, Kosuke Okabe, Masato Naruse, Tohru Taino, Hiroaki Myoren, |
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| PDF Download Page |  PDF download Page Link |
| Abstract(in Japanese) | (See Japanese page) |
| Abstract(in English) | Digital SQUIDs with the single flux quantum (SFQ) feedback have attracted much attention because of the feasibility of realizing a wide dynamic range and high slew rate. In order to realize higher resolution, we have studied a digital SQUID with sub-flux quantum feedback. Combining the sub-flux quantum feedback to a feedback loop and the direct SFQ feedback to a main loop triggered by carry SFQ pulses from an up/down counter. After optimization of the circuit, we confirmed the maximum magnetic field amplitude exceed 1 $mu$T, the magnetic field noise is lower than 100 pT/$sqrt{mathrm{Hz}}$ with a signal band frequency of 1.22 MHz. In this study, we report a design of the digital SQUID with sub-flux quantum feedback and evaluate the performance of a magnetometer using the digital SQUID.Finally we discuss the digital filter for reducing the binary data rate in order to transfer the data from low temperature circuit to the room temperature electronics. |
| Keyword(in Japanese) | (See Japanese page) |
| Keyword(in English) | digital SQUID / ingle flux quantum (SFQ) circuit / sub-SFQ feedback / dynamic range / slew rate / digital filter |
| Paper # | SCE2017-32 |
| Date of Issue | 2018-01-24 (SCE) |
| Conference Information | |
| Committee | SCE |
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| Conference Date | 2018/1/31(1days) |
| Place (in Japanese) | (See Japanese page) |
| Place (in English) | Kikai-Shinko-Kaikan Bldg. |
| Topics (in Japanese) | (See Japanese page) |
| Topics (in English) | SQUID, high frequency, sensing technologies and their applications, etc. |
| Chair | Hiroaki Myoren(Saitama Univ.) |
| Vice Chair | |
| Secretary | (National Defense Academy) |
| Assistant | Hiroyuki Akaike(Daido Univ.) |
| Paper Information | |
| Registration To | Technical Committee on Superconductive Electronics |
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| Language | JPN |
| Title (in Japanese) | (See Japanese page) |
| Sub Title (in Japanese) | (See Japanese page) |
| Title (in English) | Design of Digital Filter for Digital SQUID with sub-Flux Quantum Feedback Resolution |
| Sub Title (in English) | |
| Keyword(1) | digital SQUID |
| Keyword(2) | ingle flux quantum (SFQ) circuit |
| Keyword(3) | sub-SFQ feedback |
| Keyword(4) | dynamic range |
| Keyword(5) | slew rate |
| Keyword(6) | digital filter |
| 1st Author's Name | Ryo Matsunawa |
| 1st Author's Affiliation | Saitama University(Saitama Univ.) |
| 2nd Author's Name | Kosuke Okabe |
| 2nd Author's Affiliation | Saitama University(Saitama Univ.) |
| 3rd Author's Name | Masato Naruse |
| 3rd Author's Affiliation | Saitama University(Saitama Univ.) |
| 4th Author's Name | Tohru Taino |
| 4th Author's Affiliation | Saitama University(Saitama Univ.) |
| 5th Author's Name | Hiroaki Myoren |
| 5th Author's Affiliation | Saitama University(Saitama Univ.) |
| Date | 2018-01-31 |
| Paper # | SCE2017-32 |
| Volume (vol) | vol.117 |
| Number (no) | SCE-428 |
| Page | pp.pp.7-11(SCE), |
| #Pages | 5 |
| Date of Issue | 2018-01-24 (SCE) |