Measurements of Correct Operation of a HTS 4-bit Shift Register Circuit
4-비트 고온초전도 Shift Register 회로의 동작 측정
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Park, Jong-Hyeog
(Superconductivity Research Laboratory, Korea Institute of Science and Technology)
;
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Kim, Young-Hwan
(Superconductivity Research Laboratory, Korea Institute of Science and Technology)
;
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Kang, Joon-Hee
(University of Inchon)
;
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Hahn, Taek-Sang
(Superconductivity Research Laboratory, Korea Institute of Science and Technology)
;
- Kim, Chang-Hoon (Superconductivity Research Laboratory, Korea Institute of Science and Technology) ;
- Lee, Jong-Min (Superconductivity Research Laboratory, Korea Institute of Science and Technology) ;
- Choi, Sang-Sam (Superconductivity Research Laboratory, Korea Institute of Science and Technology)
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박종혁
(한국과학기술연구원, 초전도 연구팀)
;
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김영환
(한국과학기술연구원, 초전도 연구팀)
;
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강준희
(인천대학교)
;
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한택상
(한국과학기술연구원, 초전도 연구팀)
;
- 김창훈 (한국과학기술연구원, 초전도 연구팀) ;
- 이종민 (한국과학기술연구원, 초전도 연구팀) ;
- 최상삼 (한국과학기술연구원, 초전도 연구팀)
- Published : 1999.08.18
Abstract
We have designed and fabricated a four-bit shift register circuit using YBCO bicrystal junctions and experimentally tested its operations by a computer-controlled digital measurement set-up. Laser ablated YBCO thin films with clean surface were used in this work. The circuit consists of the shift register and two read SQUIDs placed next to each sides of the shift register. The SQUIDs were inductively coupled to the nearby shift register stages. A probe equipped with high speed coax lines were used in this experiment. The major obstacle in testing the circuit was the interference between the read SQUIDs and we solved the problem by finding the correct operation points of the SQUIDs from the simultaneously measured modulation curves. Loaded Data("1" or "0") were successfully shifted from a stage to the next one by a controlled current pulse injected to the bias lines located between the stages and the data shifts were correctly monitored by the read SQUIDs
Keywords