A Resistor Coupled Josephson Polarity-Convertible Driver (Special Section on Superconducting Devices)
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概要
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A polarity-convertible driver is necessary as a basic component of several Josephson random access memories. This driver must be able to inject a current having positive or negative polarity into a load transmission line such as a word or bit line of the RAM. In this paper, we propose a resistor coupled Josephson polarity-convertible driver which is highly sensitive to input signals and has a wide operating margin. The driver consists of several Josephson junctions and several resistors. The input signal is directly injected to the driver through the resistors. The circuit design is discussed on the operating principle of the driver. The driver is fabricated by 1.5 μm Nb technology with Nb/AlO_x/Nb Josephson junctions, two layer Nb wirings, an Nb ground plane, Mo resistors, and SiO_2 insulators. The Nb/AlO_x/ Nb Josephson junctions are fabricated using technology refined for sub-micron size junctions. The insulators between wirings are formed using bias sputtering technique to obtain good step coverage. The driver circuit size is 53 μm×34 μm. Measurements are carried out at 10 kHz to quasistatically test the polarity-convertible function and the operating margin of the driver. Proper polarity-convertible operation is confirmed for a large operating bias margin of ±70 at a fairly small input current of 0.3 mA.
- 社団法人電子情報通信学会の論文
- 1994-08-25
著者
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NAGASAWA Shuichi
Superconductivity Research Laboratory, International Superconductivity Technology Center
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Nagasawa Shuichi
Superconductivity Research Laboratory International Superconductivity Technology Center
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Nagasawa Shuichi
Fundamental Research Laboratories Nec Corporation
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Numata H
Nec Corp. Sagamihara‐shi Jpn
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Tahara S
System Devices Research Laboratories Nec Corporation
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Tahara Shuichi
The Fundamental Research Laboratories Nec Corporation
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Hashimoto Y
System Platforms Research Laboratories Nec Corporation
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HASHIMOTO Yoshihito
the Fundamental Research Laboratories, NEC Corporation
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NAGASAWA Shuichi
the Fundamental Research Laboratories, NEC Corporation
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NUMATA Hideaki
the Fundamental Research Laboratories, NEC Corporation
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Tsuchida Sanae
the Fundamental Research Laboratories, NEC Corporation
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Tsuchida Sanae
The Fundamental Research Laboratories Nec Corporation
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