JPS58124327A - Generating circuit of superconduction timing signal - Google Patents

Abstract

PURPOSE:To make leading edges of a rectangular wave timing signal steep even when there is variance in the critical current values of Josephson junctions by supplying an input signal in a trigger pulse shape which synchronizes with a sine wave input signal and has a steep leading edge. CONSTITUTION:Input signals S1 and S2 are applied between input terminals T1 and T2, and the ground respectively; the input signal S1 uses a sine wave with enough amplitude for turnovers of Josephson junctions J1-J4 of a series circuit U1 of and the input signal S2 uses a trigger pulse which synchronizes with the signal S1 and has a steep leading edge. A resistance R1 is set to a proper value, and consequently even if all the Josephson junctions J1-J4 have slight variance in critial current value, the rectangular wave timing signal which has desired steep leading edges appears at an output terminal TO.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a superconducting timing bracket forming circuit configured using a TJ Schiffson junction, which forms a sinusoidal input signal J: a rectangular wave timing signal with a steep rise. Regarding improvements.

Conventionally, in this kind of superconducting timing signal forming circuit, as shown in Fig. 1, a plurality of N (/1 in the figure) jobs that have a critical current value approximately equal to Junction J
1. J2.・・・・・・JN is connected in series (
The series circuit U1 has a series circuit U1, and from its -*i: side, an input terminal T1 that receives a sinusoidal input (Aug. It has been proposed that one side of the resistor is connected to ground 1a, and the series circuit U1 and resistor R1 are connected at the middle point, and the output terminal TO is derived.

According to the configuration of the superconducting timing signal B forming circuit shown in FIG. 1, a sinusoidal input (1" i When a bow S1 is applied, a sinusoidal current +1 (not shown) corresponding to the human power multiplied by QS1 flows into the C series circuit IJ'I through the resistor R1. 1. Select the resistor R1 (direction) appropriately, take the monthly input as 81, take the current 11, and use one that has a certain amplitude compared to the critical current value I of the Josephson junctions J1 to JN. For example, series circuit Ll 1's di=+1? Fuson junction J1-JN
However, if there is no variation in the critical W current (lr [I) between them, the value of the current 11 reaches the critical current values I and -I in its positive and negative sections. '1
From points 11 and [1-, there is a transition from the superconducting state to the right-voltage state at the same time, and for this reason, both of the series circuits U 1 and 1-)
A rectangular wave-like electric current ffV1 (not shown) that rises sharply by 2/2 from time points 11 and 11 is obtained between the output terminal TO and the ground in the combined pressure and negative sections of the input signal 81. It is. As a result, a load R is preliminarily applied between the output terminal To and the ground.
[If connected, then t* before +< +-,
As shown in FIG. 2 (1), at each point and negative section of the input signal $1, a rectangular waveform signal that rises sharply at IL1 points t1 and t1-'(', respectively, appears at the timing signal fn,
In this case, the timing l, MMS3 takes the IC amplitude according to the number N of Josephson junctions J1...JN that constitute the series circuit U1.
It is 5.

Therefore, in the case of the conventional superconducting timing signal forming circuit shown in FIG. 1, the Josephson junctions J1 to JN forming the series circuit U1 have no fluctuation in the critical current value I between them. If so, the timing signal 83 is assumed to have a desirable waveform.

However, the Josephson junction J1. which constitutes the series circuit U1. J2. It is extremely difficult to prepare JN with no variation in critical current value ■ between them, and when the input signal S1 is viewed from the current 11, the current value changes over time. It is a sinusoidal current that changes slowly with A
~JN have variations in the critical current value I between them, all of the Josephson junctions J1~JN are
At the time points t1 and [1- when the current is applied, the state cannot be simultaneously changed to the voltage-carrying state, and the voltage-carrying state can be sequentially transferred from the di', 312 Fuson junction J1-JN or the di'-Pifson junction having a small critical current value. As a result, the timing signal 83 is obtained as a stepwise rise as shown in FIG. 2C. In this case, the disadvantage is that the timing signal S3 cannot be obtained with a desired waveform.

Accordingly, the present invention proposes a novel superconducting timing signal forming circuit which does not have the above-mentioned drawbacks, as will become clear from the detailed description below.

FIG. 3 shows an embodiment of a superconducting timing signal forming circuit according to the first invention of the present application, and corresponding parts to those in FIG. , 1st
In the configuration described above in the figure, for example, i is directly supplied to the input terminal 1-1 from one end of the series circuit U1 on the side from which the input terminal T1 to which the sinusoidal input signal is applied can be derived. “Synchronized with a sinusoidal input signal” One steep 1-
Other input end to which IJ pulse-like human input signal is given] 2
It has the same configuration as the case of FIG. 1 except that it is derived.

The above is the configuration of the embodiment of the superconducting timing signal forming circuit according to the first invention of the present application, and according to the configuration 111i, the following operations are performed.

That is, if a single sinusoidal input signal 74 S 1, as shown in FIG. 4 Δ and similar to that shown in FIG. A current 11 (not shown in the figure) with a waveform corresponding to the waveform based on S1 is connected to a resistor R.
1 to the series circuit IJ1. Therefore, by setting the value of the resistor R1 appropriately), as the input signal S1, at a current of 11 and 1, the current of the series circuit U1 is the critical current value of the Fuson junction J1-JN, and the amplitude is ζ. If the Josephson junction J1 and JN have no variation of the critical current 1+l'l Is between them, then the value of the current 11 is determined by the capacity of the current 11 and the negative In the section, people Jorefuso] / Junction J1
From the time points r1 and 11- when the critical current values IS and -IS of ~JN are reached, the Lefson junctions J1 to JN transition from the superconducting state to the voltage-bearing state.

In addition, between the input terminal T and half and the ground, in synchronization with the input signal S1, in the interval of the weight and n of the input terminal S1, times ta and ta-J: suddenly rise in the positive and negative directions, respectively. - “Ru No. 4
In figure B, the solid line and the dotted line are 1 kan small! When a pulse-like input signal S2 is applied to the input signal S2, a sinusoidal current +2 (not shown) corresponding to the waveform of the input signal S2 flows through the series circuit 21tU1.

Furthermore, a human horn signal 81 as shown in FIG. 4 is applied between the input terminal T1 and the ground, and an input signal S2 as shown in FIG. 4B is applied between the input terminal T2 and the ground. Then, the input Q Sl is 3;
11+ + 2 > (not shown) flows through the series circuit U1.

(Inputs Q31 and S2 as shown in FIG. 4A and B, respectively, are applied simultaneously between the input terminal T1 and the ground, and between the input terminal 12 and the ground, and in this case, the resistor R
Select the value of 1 appropriately, and input ``IM'' 4 S 1. Looking at the current 11, in its capacity and weight and in the negative section,
As mentioned above, from the time +1 and (1'', the series circuit tJ
1 Ji31? - Use in advance a component that returns sufficient amplitude to convert the Noson junctions J1 to JN from a superconducting state to a voltage-containing state, and also use the input QS2 to omit the input signal S1 and set it in the Ω section. At the time when [a and [a″] stand up at the time t
1 and [1' are used in advance, the time point [a
and ta-, a Josephson junction J is added to the series circuit U1.
l-・J NO) A current flows through the critical current values I and -I, which rapidly change to a more significant value. As a result, even if all of the Joe-Sefson junctions J1 to JN of the series circuit (') have some variation of the critical current value T8 between them, the capacity of the input signal 81 and In the negative interval, from the time points [a and [a- (previously)], their critical current values 1.
It is possible that all of the -)-C di''senson junctions J1 to JN transition from the superconducting state to the voltage-containing state at the same time.

Furthermore, the Josephson 18 coupling J1 of the series circuit U1 is thus
If all of JN are transferred to the voltage state, the voltage and the negative section of the input signal 81 (at time (a and t
Slightly later than a′) steeper than the point)! An ascending rectangular waveform voltage Vl (U4' in the figure) is obtained. As a result, as in the case of FIG. B to -Cl
- In the same manner as above, in the negative interval of the input signal S1, at the time ta and +a'-J:
A rectangular waveform signal that rises steeply at point IV is obtained as the timing signal 83. In this case, the timing signal S3 has an amplitude corresponding to the number N of Josephson junctions J1 to JN forming the series circuit U1.

Therefore, according to the superconducting timing signal forming circuit according to the first invention of the present application shown in FIG. Even if there is some variation, the rectangular wave timing signal S3 is output from the sinusoidal input signal S1.
It has the great feature of being able to perform 1q as having a desirable waveform with a steep rise.

Next, the first embodiment of the superconducting timing signal forming circuit according to the second invention of the present application will be described with reference to FIG. Although detailed explanation will be omitted, in the configuration shown in FIG. 3,
Furthermore, a plurality of M (four in the figure) Josephson junctions Jl'', J2 having approximately the same critical current value 16' are connected to each other.
−.

......JM- has a series circuit U2 connected in series, and the series circuit U2 has one end connected to the resistor R1 through the resistor R2 and the input terminal T1. The output terminal To is connected to the series circuit U1 in a parallel relationship by connecting the midpoint and the other end to the ground, and correspondingly, the output terminal To connects the series circuit U1 and the resistor R1. It has the same configuration as the case of FIG. 3, except that instead of being derived from the midpoint, it is derived from which midpoint of connection between the series circuit U2 and the resistor R2. In fact, the critical current value Is of the di-Sefson junctions J1' to JM- of the series circuit U2 is
'- are Josephson junctions J1 to JN of series circuit U1
is equal to the critical current value I8 of the Josephson junction J1
The number M of =~J M- is the Josephson junction J1~J
It is equal to the number N of N.

The above is the configuration of the first embodiment of the superconducting timing signal forming circuit according to the second invention of the present application, but according to the configuration described above, the following operation can be performed by IH.

That is, if a sinusoidal input signal S1 is applied between the input terminal 1 and the ground as shown in FIG. 4, as in the case of FIG. Currents 11- and 11-2 having waveforms corresponding to the currents flow through the resistors [1 and R2, respectively, and are shunted into the series circuits U1 and U2.

Therefore, the ratio of resistors R1 and R2 should be appropriately selected, and a signal having an amplitude larger than the critical current value I8 of the Josephson junctions J1 to JN of the series circuit U1 in terms of current 11-1 should be used as the n input signal S1 in advance. For example, the critical current value ■
3, the current 11-1
The value of the current ■1-1 in the total pressure and negative section,
From time points t1 and t1' when the critical current values of Josephson junctions J1 to JN reach the critical current values 18 and -2, respectively, the Josephson junctions J1 to JN transition from the superconducting state to the voltage-bearing state.

Also, between the input terminal T2 and the ground, as in the case of Fig. 3,
In synchronization with the input signal S1, in the combined pressure and negative sections of the input signal S1, the lines rise steeply in the positive and negative directions from the n points ta and ta'', respectively, as shown by the solid or dotted lines in FIG. 4B. Togi,
If an input signal S2 in the form of a 1 to 1-Riga pulse is applied, the input signal will be changed.

Furthermore, between the input terminal T1 and the ground, as in the case of Fig. 3,
If an input signal S1 as shown in FIG. 4A is applied and at the same time an input signal S2 as shown in FIG. The superimposed current ((11-1>-+-12) (not shown) of the wave-like current 11-1 and the pulse-like current I2 according to the waveform A based on the input signal S2 is the series circuit U1. It is something that flows.

Therefore, input signals S1 and S2 as shown in FIG. 4A and B are simultaneously applied between the input terminal T1 and the ground, and between the input terminal T2 and the ground, respectively, and in this case, the values of the resistors R1 and R2 are appropriately set. In the positive and negative sections of the current 11-1, the Josephson junctions J1 to JN of the series circuit U1 are selected as the seven-power signal S1, and from the time t1 and t1' as described above. Using in advance a device with a sufficient amplitude to transition from the superconducting state to the voltage state,
In addition, as the input signal S2, the time points ta and ta= rising in the 6 positive and negative sections of the input signal S1 are the time points t1 and [1
If we use in advance a time point that is slightly earlier than
Therefore, a current that rapidly changes to a value larger than the critical current value I8 of the Josephson junctions J1 to JN flows through the series circuit U1. As a result, even if all of the Josephson junctions J1 to JN of the series circuit U1 have some dispersion in the critical current value Is between them, at the point in time in the six positive and negative sections of the input signal QSI. From a moment slightly later than ta and ta'', their critical current values I, larger currents flow almost simultaneously, and thus the Josephson junctions J1 to JN
All of them transition from the superconducting state to the voltage-carrying state almost simultaneously.

Furthermore, the Josephson junction J1-J of the series circuit U1 is
If all of N is transferred to the voltage state, the superimposed current (
(11-1) Most of the resistance R
2 to the series circuit U2, and thus the series circuit ()2
The superimposed current ((T 1-1 ) −+−(I 1-2
) 1-12) flows. Therefore, in the six positive and negative sections of the input signal 81, from time points 1a and [a-, the critical current value of the Josephson junctions J1- to JM= 8- and-I.

A current flows that changes sharply to a value greater than . As a result, the di' Sefson junction Jl' of the series circuit U2
〜JM−, and C has some variation in the critical current value ls′ between them. In the 6 positive and negative sections of the input signal S1, the time point [a and ta−] is slightly delayed. Than,
Those flows, therefore Josephson junction J1-~JM
'- all transition from the superconducting state to the voltage state almost simultaneously.

Also, to the Josephson junction J1' of the series circuit U2 -JM
- transitions to the energized state, then across the series circuit U2 and thus between the output @TO and ground, in the 6 positive and negative sections of the input signal S1, slightly less than the instants ta and [a- A voltage V2 (not shown) in the form of a rectangular wave that rises steeply after the delay is obtained. As a result, if a load R is connected in advance between the output terminal TO and the ground as in the case of Fig. 3, then the load R will be connected to Fig. 4C as in the case of Fig. 3A. As shown, in the six positive and negative sections of the input signal S1, a rectangular waveform signal that rises steeply from a time point slightly later than the time points ta and ta- is obtained as the timing signal S3. In this case, the timing signal S3 has an amplitude corresponding to the number M of Josephson junctions Jl' to JM- that constitute the series circuit U2.

Therefore, according to the superconducting timing signal forming circuit according to the first invention of the present application shown in FIG. 3, the Josephson junctions J1 to JN forming the series circuit U1 have a critical current value of 1. Similarly, even if the Josephson junctions J1- to JM-, which constitute series circuits 1 and 2, have some variation in the critical current value I-, the sine A major feature is that a rectangular waveform timing signal S3 having a desirable waveform with a steep rise can be obtained from a waveform input signal S1.

Next, an embodiment of the superconducting timing signal forming circuit according to the second invention of the present application will be described with reference to FIG. 6. Parts corresponding to those in FIG. Although omitted, in the configuration described above in FIG. 5, except that a bypass resistor R3 is connected between one end of the series circuits U1 and U2 on the opposite side from the side connected to the ground. is the fifth
It has the same configuration as the figure.

The above is the configuration of the second embodiment of the superconducting timing signal forming circuit according to the second invention of the present application, but according to the configuration, it is the same as the case of FIG. 5 except for the matters mentioned above. , on the other hand, if the value of resistor R3 is appropriately selected (as shown in FIG. Currents 11-1 and I flowing through circuit U1
When the superimposed current ((11-1)+12) of 2 flows into the series circuit +j8U2 through the resistor R2, the superposed current ((11-1)+12) flows through the series circuit +j8U2 through the resistor R2.
1)+I2) is effectively passed into the series circuit U2 primarily through the resistor R3 (9).

Therefore, according to the superconducting timing signal forming circuit according to the second invention of the present application shown in FIG. 6, as in the case of the superconducting timing signal forming circuit according to the second invention of the present application shown in FIG. The waveform input signal S1 has the great feature of being able to convert the single-bit waveform timing signal S3 into a desired waveform with a steep rise.

In addition, in the first description, only a few embodiments are shown next to each of the present invention box 1 and the second invention, for example, i to rigged pulse-shaped input 18, etc.! The input terminal T2 which can be input to the input terminal T2 can be led out from one end of the series circuit U1 via a resistor, and various other modifications and changes can be made without departing from the spirit of the present invention. Dew.

[Brief explanation of drawings]

Fig. 1 is a connection diagram showing a conventional superconducting timing signal forming circuit, Fig. 2 is a signal waveform diagram for explaining the same, and Fig. 3 is an implementation of a superconducting timing signal forming circuit based on the invention of the present application box 1M opening. A connection diagram showing an example, FIG. 4 a waveform diagram for explaining the same, and FIGS. 5 and 6 show the first and second embodiments of the superconducting timing signal forming circuit according to the second invention of the present application. FIG. In the figure, U 1 and IJ 2 + twist 11 circuit 1, no 1
, N, and J1- to JM- are Josephson junctions, R1゜R2 and R3 are resistors, 11 and T2 are input terminals,
To is the output end, RL is the load/? show. Hi 51 Ku = Q Figure 8

Claims (1)

[Claims] A critical current approximately equal to 1.17 (+ a small number of N di, -]t? Fuson junction J1.J2...
... has a first series circuit in which JNs are connected in series, and a first input signal Qiiii to which a sinusoidal first input signal is applied from one end side of the first series circuit. A second input terminal receives a second input signal in the form of a trigger pulse with a steep rise that is synchronized with the first input signal, and -1- the other end of the first series circuit is grounded. A superconducting timing signal forming circuit characterized in that the output end is led out from one end of the first series circuit connected to the ground of the first series circuit (1a) and the other end of the first series circuit (j). , a plurality of N di=
+t Fuson junction Jl, J2.・・・・・・・・・The first series circuit where JN is directly connected to the
, I - The ends of the first series circuit J, 'J, U sinusoidal first input (the first input terminal after 8 and the first input terminal synchronous with the first input terminal) t) of the second input signal in the form of a steep trigger pulse of A plurality of Sielfson junctions J 1 with a critical current value approximately equal to Fl are connected to ground on either side and are connected in parallel to the first serial circuit.
” , J 2- , ......JM- are connected in series to form a second series circuit of 18 series, and A superconducting timing signal blade forming circuit characterized in that an output end is derived from one end on the opposite side.