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Experimental realisation of a resistive single flux quantum logic circuit

Microelectronics JournalSep 1, 19880 citations

Demonstration of single flux quantum logic gates by using local magnetic flux bias technique

Shunta Asada, Yuki Yamanashi, Nobuyuki Yoshikawa

The Japan Society of Applied PhysicsJan 28, 20200 citations

Demonstration of convertor circuits between half-flux-quantum and single-flux-quantum logic

Yusuke Nakamura, Daiki Hasegawa, Yuto Takeshita +4 more

The Japan Society of Applied PhysicsJan 26, 20210 citations

Experimental realization of a resistive single flux quantum logic circuit

V. P. Koshelets, K. K. Likharev, V. V. Migulin +5 more

An integrated circuit including all basic components of the recently suggested Resistive Single Flux Quantum (RSFQ) logic family has been designed, fabricated and tested successfully. The circuit includes a generator of periodic SFQ pulses, four buffer/amplifier stages for splitting, channeling and regeneration of the pulses, a detector/load stage, and universal RSFQ logic gate (here performing the NOT function). The 10μm design rule circuit employs 13 active Nb - Al2O3- Nb Josephson junctions with the critical current density ∼ 0.5 kA/cm2. externally shunted by Mo resistors with R 1 Ohm. The shunting provided critical damping of the junctions (\beta_{c}\lsim 1) and reasonable (\sim 500 \muV) IcR product. The circuit operation has been tested by measurement of dc voltages\bar{V}_{i}across various Josephson junctions as functions of the dc current through the pulse generator. Correct and stable operation of the circuit for the clock frequencies from 0 to ∼30 GHz has been demonstrated.An integrated circuit including all basic components of the recently suggested Resistive Single Flux Quantum (RSFQ) logic family has been designed, fabricated and tested successfully. The circuit includes a generator of periodic SFQ pulses, four buffer/amplifier stages for splitting, channeling and regeneration of the pulses, a detector/load stage, and universal RSFQ logic gate (here performing the NOT function). The 10μm design rule circuit employs 13 active Nb - Al2O3- Nb Josephson junctions with the critical current density ∼ 0.5 kA/cm2. externally shunted by Mo resistors with R 1 Ohm. The shunting provided critical damping of the junctions (\beta_{c}\lsim 1) and reasonable (\sim 500 \muV) IcR product. The circuit operation has been tested by measurement of dc voltages\bar{V}_{i}across various Josephson junctions as functions of the dc current through the pulse generator. Correct and stable operation of the circuit for the clock frequencies from 0 to ∼30 GHz has been demonstrated.

IEEE Transactions on MagneticsMar 1, 198739 citations

Single Flux Quantum Integrated Circuit Design

Gleb Krylov, Tahereh Jabbari, Eby G. Friedman

Springer eBooksJan 1, 202420 citations

Experimental demonstration of single flux quantum logic with resettable latch

Futoshi Furuta, A. Akahori, N. Mori +6 more

We report experimental demonstrations of logic functions based on single flux quantum logic with resettable latch (SFQ-RL) logic. SFQ-RL has been proposed as new SFQ logic, which enables us to initialize the whole circuit. This initialization function is essential for the state machine into which conventional SFQ logic is classified, and makes SFQ logic more applicable to a large-scale logic system, such as a processor. In addition, the function can prevent circuits from performing the failed operation caused by a trapped flux in storage loops. The logic consists of three primitives, which can compose any logic function. We have experimentally demonstrated the operation of "half adder" based on SFQ-RL with the bias margin of /spl plusmn/16%. In order to examine the function of initialization, we designed and evaluated a pseudo random sequence generator by numerical simulation. In addition, we experimentally confirmed the initialization of the generator and "circular buffer" with the bias margin of /spl plusmn/20%.We report experimental demonstrations of logic functions based on single flux quantum logic with resettable latch (SFQ-RL) logic. SFQ-RL has been proposed as new SFQ logic, which enables us to initialize the whole circuit. This initialization function is essential for the state machine into which conventional SFQ logic is classified, and makes SFQ logic more applicable to a large-scale logic system, such as a processor. In addition, the function can prevent circuits from performing the failed operation caused by a trapped flux in storage loops. The logic consists of three primitives, which can compose any logic function. We have experimentally demonstrated the operation of "half adder" based on SFQ-RL with the bias margin of /spl plusmn/16%. In order to examine the function of initialization, we designed and evaluated a pseudo random sequence generator by numerical simulation. In addition, we experimentally confirmed the initialization of the generator and "circular buffer" with the bias margin of /spl plusmn/20%.

IEEE Transactions on Applied SuperconductivityJun 1, 20005 citations

Experimental demonstration of an integrated resistive single flux quantum logic structure

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