JPH0481020A - Ternary multiplication circuit device - Google Patents

Abstract

PURPOSE:To increase speed and to reduce energy consumption by outputting a ternary multiplying operation while executing control so that another arithmetic circuit can be turned to a voltage state when one arithmetic circuit is set in a superconductive state. CONSTITUTION:First and second arithmetic circuits 30 and 40 are provided with at least one or more superconducting circuit elements equipped with a superconductive element to be switched between the superconductive state and a normal conductive state corresponding to a threshold characteristic. Each superconducting circuit element of the first arithmetic circuit 30 and each superconductive circuit element of the second arithmetic circuit 40 are coupled by a control current supply line, and corresponding to an arithmetic command, any one of three control currents is supplied to the control current supply line. Then, either the superconductive state or the voltage state is outputted from the first and second arithmetic circuits 30 and 40 and based on the output of the first and second arithmetic circuits 30 and 40, any one of three logic values is outputted. Thus, the speed can be increased and the energy consumption can be reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an arithmetic circuit device that performs three-value multiplication using superconducting elements.

(Prior art) As a three-piece arithmetic circuit using superconducting elements, the same applicant has already published Japanese Patent Application Laid-Open No. 63-98220 (Patent Application No. 61-2).
No. 44352), in which the circuit shown in FIG. 3 is proposed. In this figure, a P circuit l that generates a positive voltage state and an n circuit 2 that generates a negative voltage state are connected, and the two control signal current lines of the two circuits are connected to the two control signal currents of the n circuit. They are added so that the lines and directions are the same. Jl, J2 in the figure. J3. J4 is a superconducting element such as a Josephson element. Such a circuit can perform 3-value double negation and logical sum operation (OR), but in order to perform 3-value multiplication, it is necessary to connect multiple basic circuits that can perform such OR operation and double negation. and then perform the calculation.

(Problems to be Solved by the Invention) The three arithmetic circuit device having the Josephson element described above can perform basic arithmetic circuits such as negation, double negation, OR, and AND. However, in order to perform a single integrated function such as multiplication, a plurality of the above-mentioned basic circuits must be used.

This increases the number of elements and circuits, and also slows down the speed at which multiplication is accomplished.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to eliminate the above-mentioned drawbacks and provide an arithmetic circuit that can perform three multiplication operations at high speed and with low power consumption using a basic circuit device set.

(Means for Solving the Problem) A three-multiplying circuit device according to the present invention includes at least one superconducting element that switches between a superconducting state and a normal conducting state according to dark value characteristics. a first having a conductive circuit element;
and a second arithmetic circuit, each superconducting circuit element of the first arithmetic circuit and each superconducting circuit element of the second arithmetic circuit are coupled by a control current supply line, and a value is adjusted according to an arithmetic command. Three different systems? A control current of one of the Il currents is supplied to the control current supply line to cause the first and second arithmetic circuits to output a superconducting state or a voltage state, and based on the outputs of the first and second arithmetic circuits. The device is characterized in that it is configured to output any one of three logical values.

In this way, since the control current supply lines of each superconducting circuit element of the first and second arithmetic circuits are coupled so that their directions are opposite, any one of the three control current values By supplying a control current of Output the output value corresponding to the input. As a result, a three-value multiplication operation can be performed with a simple circuit configuration.

Table 1 (Embodiment) FIG. 1 is a circuit diagram showing the configuration of an embodiment of an arithmetic circuit that performs three-value multiplication according to the present invention. In the present invention, a P circuit 30 that generates a positive voltage state and an N circuit 40 that generates a negative voltage state are coupled to a control current supply line via resistors R3 and R4, and load impedances RL and LL are connected to the middle point of the P circuit 30 that generates a positive voltage state and the N circuit 40 that generates a negative voltage state.
is connected, three voltage states, positive and O1 negative, are output to the load resistor to perform three-value multiplication. The direction of the current flowing from the terminal 6 of the control current supply line is the same for the 2nd circuit and the n circuit, but the direction of the current flowing from the terminal 7 is opposite for the 2nd circuit and the n circuit. , multiplication can be performed with one basic element.

The P circuit 30 includes two Josephson elements J5 and J6, inductances LP5 and LP6 for coupling to the control line, a damping resistor R1, and two inductances LP1. for coupling the current of the input signal IX to the Josephson elements. L
P2, two inductances LP3 and LP4 for coupling the current of the input signal IY to the Josephson element, and a terminal 5 for passing a positive bias current to this element. Similarly to the second circuit, the n circuit 40 includes two Josephson elements J7 and J8, and their inductance L n5.
L n6, damping resistor R2, control current and Josephson elements J7 and J8, and their inductances Ln3 and Ln
4#, Lnl and Ln2, and a terminal 8 for flowing a negative bias current.

FIGS. 2(a) and 2(b) show the P circuit 30 and n
4 is a diagram showing the dark value characteristics of each Josephson element of the circuit 40. FIG. Since the 2nd circuit is supplied with a bias current of +IB, its operating point is at point A when no signal current tX is applied, and the operating point of the n circuit is at point D because it is supplied with a bias current of -IB.

In this state, the control current IX, :! :When a negative current flows through IY, two limiting currents are applied in the negative direction in the two circuits, so the operating point moves to the zero point via point B, and the two circuits switch to a positive voltage state. do. In the n-circuit, the two control lines are connected in opposite directions, so the operating point remains at point D and remains in the superconducting state. Therefore, a positive voltage is generated in the load impedance shown in FIG. 1, and a positive current flows. Next, when a negative direction current is added to the signal current of IX and a positive direction current is added to the signal current of IY, the control currents are canceled out in the two circuits shown in Figure 2 (a), the operating point remains at point A, and the two circuits become superconducting. In FIG. 2(b) of the n circuit, the control current is applied in the negative direction, so the operating point moves from point E to point F, and the n circuit switches to a negative voltage state. Therefore, the terminal current of the load impedance becomes a negative current, and a negative current flows through RL in FIG. Next, when a positive current is supplied to the signal currents of IX and IY, the control currents of the two circuits are added in the positive direction, so the operating point moves from point A to point H via point G.
2 circuits switch to a positive voltage state. In the n-circuit, the control currents cancel each other out, so the operating point remains at point D, maintaining the superconducting state. Therefore, the terminal voltage of the load impedance becomes a positive voltage, and a positive current flows through the load impedance.

In the case of O current with control signals IX and IY, two circuits are also n
The circuit also remains in a superconducting state and the terminal voltage of the load impedance remains zero.

The zero, positive, and negative states of the control current are set to 0. −11, and the zero, positive, and negative voltage states of the terminal voltage of the load resistor RL are O, +
1. If it is set to -1, the truth table shown in Table 1 is obtained, and the multiplication operation can be executed.

[Brief explanation of drawings]

FIG. 1 is a circuit diagram showing the configuration of an embodiment of an arithmetic circuit that performs three-value multiplication according to the present invention, and FIG. 2(a) and FIG. 2(b) are each Joseph FIG. 3 is a diagram showing the dark value characteristics of a superconducting element, and FIG. 3 is a circuit diagram of a three-value arithmetic circuit using a superconducting element according to the prior art. 1.30...2 circuits 2.40...n circuit 5...Terminal for flowing positive bias current 6.7...
- Terminal 8 of control current supply line...Terminal JL for flowing negative bias current J2. J3. J4. J5
．． J6. J7. J8...Josephson element Lnl, Ln2. Ln3. Ln4. Ln5.
Ln6. Lpl+ Lp2Lp6...Inductance LL, RL...Load impedance R1, R2...Damping resistance R3, R4...Resistance Lp3. Lp4. Lp5

Claims (1)

[Claims] 1. Connect the first and second arithmetic circuits including a superconducting element that switches between a superconducting state and a normal conducting state according to threshold characteristics, and connect the control current supply line of the first circuit to the control current supply line of the second circuit. When connecting to the line, connect them so that the current directions are opposite to each other, and supply one of the three control currents with different values to the control current supply line according to the three-value multiplication command. A ternary multiplication circuit device characterized in that, if one arithmetic circuit is in a superconducting state, the other arithmetic circuits are controlled to be in a voltage state and output an output of a ternary multiplication operation.