2005 Fiscal Year Final Research Report Summary
Single Flux Quantum Logic Circuits Constructed by the Use of Two Thresholds of SQUID
| Project/Area Number |
16500045
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Computer system/Network
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| Research Institution | Tsuyama National College of Technlogy |
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Principal Investigator |
KAWAI Masahiro Tsuyama National College of Technology, Department of Electronics and Computer Engineering, Professor, 情報工学科, 教授 (40186052)
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| Project Period (FY) |
2004 – 2005
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| Keywords | Superconductive Logic Circuit / Single Flux Quantum / SFQ / Thleshold logic / SQUID |
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| Research Abstract |
The existence of Single Flux Quantum(SFQ) is made to correspond to logic 1 and logic 0 in SFQ logic circuits. However, in SFQ logic circuit, SFQ of a clockwise rotation and a counterclockwise rotation has circumference current. If these two kinds of SFQs are used, SFQ logic circuit which has two thresholds will be constructed.
In the threshold logic, if threshold increases, a logic function realizable with one element will increase. For this reason, if SFQ logic circuit construction using two threshold can be realized, it will be the number required for circuit composition of elements can be reduced.
In this research, I consider the construction of a magnetic coupled type and a current injection type, respectively. Thereby, composition can do the circuit using two thresholds. By using two thresholds, it succeeded in constituting all 2 input logic functions from one basic SFQ logic circuit.
With current injection type composition, the direction of the circumference current of SFQ is made to a clockwise rotation and a counterclockwise rotation by changing the connection position of an input. Thereby, composition can do the circuit using two thresholds. By using two thresholds, it succeeded in constituting seven kinds of 2 input logic functions from one basic circuit. Three kinds of 2 input logic functions which remain can consist of adding a negative circuit.
Future subjects are improving current pouring type composition and examining the construction of 3 input logic function.
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