JPS59143926A - Structure of josephson interferometer - Google Patents

Abstract

PURPOSE:To facilitate and simplify the wiring between interferometers or to other circuit and to improve the integration degree of a Josephson LSI, in the Josephson LSI including a Josephson interferometer, which comprises a base electrode constituting a Josephson element, an insulating layer for forming a junction, a counter electrode, and control lines, by providing terminals for selectively connecting wirings at the four corners of the base electrode layer. CONSTITUTION:Output terminal 301 and 302 made of a base electrode layer are added to a Josephson interferometer 300, and output terminals are provided at four places. By using an interferometer 300, the output terminal 302 is connected to other circuit, e.g., to an input terminal 201 of a current-injection type logic circuit 200 by a wiring 401, without using wiring channels 220, instead of using an output terminal 107. For the output terminal 107, another metal layer, e.g., a ground contact layer, may be used instead of the base electrode layer.

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a Josephson interferometer, and particularly to a Josephson interferometer suitable for easily connecting with other circuits and improving the degree of integration of a Josephson LSI. Regarding the structure of the meter.

[Prior art]

Conventional Josephson interferometers have one or two output terminals, and therefore have the disadvantage that, when scaled to an LSI, connections between interferometers or connections with other circuits, that is, wiring become complicated. This will be explained in detail using FIGS. 1 and 2.

The conventional Josephson interferometer 100 has a base electrode 101
, a Josephson junction 102, a counter electrode 103, a control line 104, and a power supply resistor 105, and has two output terminals 106 and 107.

Therefore, as shown in Fig. 2(a), the Josephson interferometer 1
Consider a case where the output terminal 107 of 00 is connected to another circuit, for example, the input terminal 201 of the current injection type logic circuit 200. In order to prevent a short circuit with the horizontal wiring channel 210 made in the control line layer used for wiring the control line 104, it is necessary to connect it using one of the vertical wiring channels 220 made up of the base electrode layer. .

In addition, as shown in FIG. 2(b), the vertical wiring channel 220
If the output terminal 106 is used for wiring other circuits and cannot be used, the output terminal 106 is connected to the input terminal 201 of the current injection type logic circuit 200 using the vertical wirings 221 and 222.

As mentioned above, as the scale of Josephson circuits increases, conventional Josephson interferometers are limited to two output terminals, so wiring channels are always dedicated, wiring becomes longer, etc. The disadvantage is that it is complicated.

[Purpose of the invention]

An object of the present invention is to provide a Josephson interferometer that can easily and simply wire the interferometers or with other circuits to improve the degree of integration of the Josephson LSI. It is in.

[Summary of the invention]

The invention is based on the fact that the output of the Josephson interferometer need not be taken only from the vicinity of the feed resistor, but can be taken from all parts of the base electrode. Note that this is because the base electrode is a superconducting thin film.

[Embodiment] An embodiment of the present invention will be described below with reference to FIGS. 3 and 4.

FIG. 3 is an example of a Josephson interferometer 300 in which four output terminals are provided by adding output terminals 301 and 302 made of base electrode layers to the conventional Josephson interferometer 100.

FIG. 4 shows an example in which this interferometer 300 is used and wiring is similar to that shown in FIGS. 2(a) and 2(b). Output terminal 1
By using the wiring 401 from the output terminal 302 instead of 070, it is possible to connect to the input terminal 201 of another circuit, for example, the current injection type logic circuit 200, without using the wiring channel 220.

Note that the output terminal of the present invention may use another metal layer, such as a ground contact layer, instead of the base electrode layer.
According to the present invention, in a circuit including a Josephson interferometer, wiring channels can be saved and the wiring length can be shortened.

〔Effect of the invention〕

According to the present invention, in a large-scale circuit including a Josephson interferometer, it is possible to connect to other circuits without using wiring channels, and wiring in a Josephson LSI can be performed more easily than in the past. .

Generally speaking, in order to improve the degree of integration of an LSI, it is important to minimize the number of wiring channels and shorten the length of the wiring.9 The present invention has the effect of completely improving the integration of a Josephson LSI.

[Brief explanation of the drawing]

Figure 1 shows the structure of a conventional Josephson interferometer, and Figure 2 (a
), (b) is an example of wiring when using the interference shown in FIG. 1, and FIG. 3 is the structure of the Josephson interferometer of the present invention. FIG. 4 shows an example of wiring. 106.10.7, 301, 302... Output terminal. Patent application Artificial detachment/Makoto Yamataka Ishita - ■ 1 Figure/ρl Rock 3 Zugun lI Figure

Claims (1)

[Claims] A Josephson interferometer consisting of a base electrode, an insulating layer for forming a junction, a counter electrode, and a control line constituting a Josephson element, wherein terminals for selectively connecting wiring are provided in the squares of the base electrode layer. The structure of the Josephson interferometer is characterized by: