| Presentation | 2020-11-25 Enhanced Operation Frequencies of Bipolar Double-Flux-Quantum Amplifiers Fabricated Using a Nb 10-kA/cm2 Integration Process Yuta Somei, Hiroshi Shimada, Yoshinao Mizugaki, |
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| PDF Download Page |  PDF download Page Link |
| Abstract(in Japanese) | (See Japanese page) |
| Abstract(in English) | A Double-Flux-Quantum Amplifier (DFQA) is a superconducting voltage multiplier that can generate a high-precision voltage based on the AC Josephson effect. Taking advantage of this feature, we have used it as a voltage multiplier in a superconducting Digital-to-Analog converter based on a Single Flux Quantum (SFQ) circuit. Since the output voltage generated at a DFQA depends on the frequency of input SFQ pulse train, high-speed performance should be required for a high-output DFQA. In this study, we tested a DFQA fabricated using a Nb 10-kA/cm2 integration process, which was expected to operate four times higher than those previously fabricated using a Nb 2.5-kA/cm2 process. The tested DFQA was laid out so that 19 three-junction loops, basic components of a DFQA, were connected in series to realize a voltage multiplication factor of 20-fold. As a result of measurements using liquid helium, it was confirmed that 20-fold multiplication was correctly performed up to input frequencies of 70.9 and 61.1 GHz for the positive and negative voltage, respectively. |
| Keyword(in Japanese) | (See Japanese page) |
| Keyword(in English) | SFQ circuits / Double-Flux-Quantum Amplifier / Superconducting voltage multiplier / Superconducting integrated circuits |
| Paper # | SCE2020-9 |
| Date of Issue | 2020-11-18 (SCE) |
| Conference Information | |
| Committee | SCE |
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| Conference Date | 2020/11/25(2days) |
| Place (in Japanese) | (See Japanese page) |
| Place (in English) | Online conference |
| Topics (in Japanese) | (See Japanese page) |
| Topics (in English) | |
| Chair | Satoshi Kohjiro(AIST) |
| Vice Chair | |
| Secretary | (NICT) |
| 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) | Enhanced Operation Frequencies of Bipolar Double-Flux-Quantum Amplifiers Fabricated Using a Nb 10-kA/cm2 Integration Process |
| Sub Title (in English) | |
| Keyword(1) | SFQ circuits |
| Keyword(2) | Double-Flux-Quantum Amplifier |
| Keyword(3) | Superconducting voltage multiplier |
| Keyword(4) | Superconducting integrated circuits |
| 1st Author's Name | Yuta Somei |
| 1st Author's Affiliation | The University of Electro-Communications(UEC) |
| 2nd Author's Name | Hiroshi Shimada |
| 2nd Author's Affiliation | The University of Electro-Communications(UEC) |
| 3rd Author's Name | Yoshinao Mizugaki |
| 3rd Author's Affiliation | The University of Electro-Communications(UEC) |
| Date | 2020-11-25 |
| Paper # | SCE2020-9 |
| Volume (vol) | vol.120 |
| Number (no) | SCE-251 |
| Page | pp.pp.7-11(SCE), |
| #Pages | 5 |
| Date of Issue | 2020-11-18 (SCE) |