IEEE Transactions on Magnetics

A novel ternary logic circuit using Josephson junction

Michitada Morisue, K. Oochi, M. Nishizawa

Published Mar 1, 1989• 6 citations

Abstract

A novel Josephson complementary ternary logic (JCTL) circuit is described. This fundamental circuit is based on the combination of two SQUIDs (superconducting quantum interference devices), one of which is switched in the positive direction and the other in the negative direction. The JCTL can perform the fundamental operations of AND, OR, NOT, and Double NOT in ternary form. The principle of the operation and design criteria are described in detail. Simulation results show that reliable operation of these circuits can be achieved with a high performance.>

DOI: 10.1109/20.92418

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IEEE Transactions on Magnetics

A novel ternary logic circuit using Josephson junction

Michitada Morisue, K. Oochi, M. Nishizawa

Published Mar 1, 1989• 6 citations

Publisher

Abstract

DOI: 10.1109/20.92418

Related papers

JCTL: a Josephson complementary ternary logic circuit

Michitada Morisue, Kentaro Ochi, M. Nishizawa

A novel complementary ternary logic circuit using Josephson junctions as switching gates is described. The principle of the circuit is based on the tristate of a Josephson junction, that is the state of switching in either positive direction or negative direction, in addition to the state of no switching. The JCTL is constructed of two SQUIDs (superconducting quantum interference devices), one of which is switched in the positive directions and the other in the negative direction. The JCTL can perform the fundamental operations of AND, OR, and NOT in ternary form and can function as a full adder if the voltage-current characteristics of the two SQUIDs are adjusted appropriately. The advantage of the JCTL is its higher speed of operation with higher density than the conventional Josephson binary logic circuit. The principle of operation is described in detail, and simulation results are presented.>A novel complementary ternary logic circuit using Josephson junctions as switching gates is described. The principle of the circuit is based on the tristate of a Josephson junction, that is the state of switching in either positive direction or negative direction, in addition to the state of no switching. The JCTL is constructed of two SQUIDs (superconducting quantum interference devices), one of which is switched in the positive directions and the other in the negative direction. The JCTL can perform the fundamental operations of AND, OR, and NOT in ternary form and can function as a full adder if the voltage-current characteristics of the two SQUIDs are adjusted appropriately. The advantage of the JCTL is its higher speed of operation with higher density than the conventional Josephson binary logic circuit. The principle of operation is described in detail, and simulation results are presented.>

IEEE International Symposium on Multiple-Valued Logic (ISMVL)Jan 1, 19888 citations

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Michitada Morisue, Jun Endo, T. Morooka +2 more

A novel Josephson ternary logic circuit to perform multiplication is proposed. The fundamental circuit of the multiplier is based on Josephson complementary ternary logic circuit (JCTL). In this paper the principle of the ternary multiplier is described. We have fabricated the multiplier using SQUIDs which were made of Nb/AlOx/Al/Nb junctions, and measurements of the logic operation of the circuit were carried out. The results showed satisfactory operation of the multiplier, which agreed well with the results of simulation. The advantages of the proposed ternary multiplier are capability of ultra-high speed computation, low power consumption and very simple construction with less number of elements to perform a ternary multiplication.A novel Josephson ternary logic circuit to perform multiplication is proposed. The fundamental circuit of the multiplier is based on Josephson complementary ternary logic circuit (JCTL). In this paper the principle of the ternary multiplier is described. We have fabricated the multiplier using SQUIDs which were made of Nb/AlOx/Al/Nb junctions, and measurements of the logic operation of the circuit were carried out. The results showed satisfactory operation of the multiplier, which agreed well with the results of simulation. The advantages of the proposed ternary multiplier are capability of ultra-high speed computation, low power consumption and very simple construction with less number of elements to perform a ternary multiplication.

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Bistable All-Josephson Junction SQUID with Dual Φ-Junctions for State-Controlled Superconducting Circuits

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A bistable superconducting quantum interference device (SQUID) exclusively comprising Josephson junctions (JJs) is proposed. The design integrates two $2 \Phi$ -JJs within the loop structure, while the state of the SQUID is monitored through a conventional $2 \pi$ -periodic $\mathbf{J J}$ ( $\mathbf{0}$ -JJ). This configuration eliminates the need for geometric inductors, leveraging the nonlinear phase dynamics for bistability. Extensive simulations confirm robust bistable operation under controlled external flux bias, positioning the proposed SQUID as an area-efficient building block for superconducting memory cells, sensors for various applications, and SFQ-compatible logic elements.A bistable superconducting quantum interference device (SQUID) exclusively comprising Josephson junctions (JJs) is proposed. The design integrates two $2 \Phi$-JJs within the loop structure, while the state of the SQUID is monitored through a conventional $2 \pi$-periodic $\mathbf{J J}$ ($\mathbf{0}$-JJ). This configuration eliminates the need for geometric inductors, leveraging the nonlinear phase dynamics for bistability. Extensive simulations confirm robust bistable operation under controlled external flux bias, positioning the proposed SQUID as an area-efficient building block for superconducting memory cells, sensors for various applications, and SFQ-compatible logic elements.

IEEE Computer Society Annual Symposium on VLSIJul 6, 20251 citation

Complementary Josephson junction devices and circuits: a possible new approach to superconducting electronics

Esin Terzioglu, M. R. Beasley

We present a superconducting logic family whose operation relies on the availability of a current gain greater than one, based on the analogy to semiconductor complementary metal-oxide-semiconductor (CMOS) logic family. The Complementary Josephson Junction (CJJ) logic family utilizes two types of nonlatching devices: a conventional device and a complementary device. The conventional device has a finite critical current, and the complementary device has zero critical current with no input applied. When the input is high, the complementary device has a finite critical current, while the conventional device has zero critical current. The bias current can be steered between a branch with a complementary device and a branch with a conventional device performing logic (and memory) functions. We can also use a resistor as a load to a complementary device. We call this circuit topology the Resistor Complementary Josephson Junction (RCJJ) family. It is analogous to the semiconductor PMOS/resistor logic family. In this paper, we investigate methods of realizing complementary devices, and we present a preliminary analysis of speed, margins, and power dissipation in simple CJJ and RCJJ inverter circuits.We present a superconducting logic family whose operation relies on the availability of a current gain greater than one, based on the analogy to semiconductor complementary metal-oxide-semiconductor (CMOS) logic family. The Complementary Josephson Junction (CJJ) logic family utilizes two types of nonlatching devices: a conventional device and a complementary device. The conventional device has a finite critical current, and the complementary device has zero critical current with no input applied. When the input is high, the complementary device has a finite critical current, while the conventional device has zero critical current. The bias current can be steered between a branch with a complementary device and a branch with a conventional device performing logic (and memory) functions. We can also use a resistor as a load to a complementary device. We call this circuit topology the Resistor Complementary Josephson Junction (RCJJ) family. It is analogous to the semiconductor PMOS/resistor logic family. In this paper, we investigate methods of realizing complementary devices, and we present a preliminary analysis of speed, margins, and power dissipation in simple CJJ and RCJJ inverter circuits.

IEEE Transactions on Applied SuperconductivityJun 1, 1998104 citations

Josephson compensating junction logic

C.J. Anderson

A Josephson superconducting quantum interference device (SQUID) digital logic family was developed that uses the R/sub nn/ region of a Josephson junction (JJ) to compensate for variations in where R/sub nn/ is the effective resistance of a JJ in the linear I-V region beyond the gap. The basic compensating junction logic (CJL) circuit is two 2-input-OR 1-2-1 interferometer isolators that, when switched, inject current into a 2-input-AND 1-2-1 interferometer. The R/sub nn/ region of several JJs is used in series with a resistor to set the current from the power supply to the 2-input-OR interferometers. The 2-input-AND interferometer is implemented with both current injection and magnetic coupling. The latch circuit uses both current injection and magnetic coupling design techniques to increase the range of I/sub O/, inductance, and resistance variation over which the latch will function correctly. Experimental measurements of CJL circuits are described.>A Josephson superconducting quantum interference device (SQUID) digital logic family was developed that uses the R/sub nn/ region of a Josephson junction (JJ) to compensate for variations in where R/sub nn/ is the effective resistance of a JJ in the linear I-V region beyond the gap. The basic compensating junction logic (CJL) circuit is two 2-input-OR 1-2-1 interferometer isolators that, when switched, inject current into a 2-input-AND 1-2-1 interferometer. The R/sub nn/ region of several JJs is used in series with a resistor to set the current from the power supply to the 2-input-OR interferometers. The 2-input-AND interferometer is implemented with both current injection and magnetic coupling. The latch circuit uses both current injection and magnetic coupling design techniques to increase the range of I/sub O/, inductance, and resistance variation over which the latch will function correctly. Experimental measurements of CJL circuits are described.>

IEEE Transactions on Applied SuperconductivityMar 1, 19930 citations

Implementation of new superconducting neural circuits using coupled SQUIDs

Yoshinao Mizugaki, Kensuke Nakajima, Yasuji Sawada +1 more

A novel superconducting neuron circuit and two types of variable synapses, which are based on superconducting quantum interferometer devices (SQUIDs), are presented. A neuron circuit with good input-output isolation and steep threshold characteristics is accomplished using a combination of a single-junction SQUID coupled to a double-junction SQUID. The quantum state of the single-junction SQUID represents the neuron state, and the output voltage of the double-junction SQUID, which is operated in a nonlatching mode with shunt resistors, is a sigmoid-shaped function of the input. Both variable synapse circuits are composed of multiple shunted double-junction SQUIDs. The first type changes its conductance value by using both superconducting and voltage states. The second variable synapse circuit changes its output current digitally by switching its bias currents. Besides numerical simulations of the circuit characteristics, we have fabricated superconducting neural chips in a Nb/AlO/sub x//Nb Josephson junction technology. The fundamental operation of each element and a 2-bit neural-based A/D converter have been successfully tested. A learning system with a variable synapse is also discussed.>A novel superconducting neuron circuit and two types of variable synapses, which are based on superconducting quantum interferometer devices (SQUIDs), are presented. A neuron circuit with good input-output isolation and steep threshold characteristics is accomplished using a combination of a single-junction SQUID coupled to a double-junction SQUID. The quantum state of the single-junction SQUID represents the neuron state, and the output voltage of the double-junction SQUID, which is operated in a nonlatching mode with shunt resistors, is a sigmoid-shaped function of the input. Both variable synapse circuits are composed of multiple shunted double-junction SQUIDs. The first type changes its conductance value by using both superconducting and voltage states. The second variable synapse circuit changes its output current digitally by switching its bias currents. Besides numerical simulations of the circuit characteristics, we have fabricated superconducting neural chips in a Nb/AlO/sub x//Nb Josephson junction technology. The fundamental operation of each element and a 2-bit neural-based A/D converter have been successfully tested. A learning system with a variable synapse is also discussed.>

IEEE Transactions on Applied SuperconductivityMar 1, 199439 citations

A bistable superconducting quantum interference device (SQUID) exclusively comprising Josephson junctions (JJs) is proposed. The design integrates two

2 \Phi

-JJs within the loop structure, while the state of the SQUID is monitored through a conventional

2 \pi

-periodic

\mathbf{J J}

(

\mathbf{0}

-JJ). This configuration eliminates the need for geometric inductors, leveraging the nonlinear phase dynamics for bistability. Extensive simulations confirm robust bistable operation under controlled external flux bias, positioning the proposed SQUID as an area-efficient building block for superconducting memory cells, sensors for various applications, and SFQ-compatible logic elements.