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Cryotron Decoding Or Selecting Matrix

IP.com Disclosure Number: IPCOM000097651D
Original Publication Date: 1961-Mar-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 45K

Publishing Venue

IBM

Related People

Haynes, MK: AUTHOR

Abstract

The function of the X selection matrix at the left is to selectively apply current to drive lines extending horizontally through the memory shown in block form. Current is supplied to the matrix by current source I. This current flows either directly through the gates of four cryotrons 14, 10, 12 and 16 or, if one of these cryotrons is driven resistive, through the one of the four lines which is connected in parallel across that gate.

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Cryotron Decoding Or Selecting Matrix

The function of the X selection matrix at the left is to selectively apply current to drive lines extending horizontally through the memory shown in block form. Current is supplied to the matrix by current source I. This current flows either directly through the gates of four cryotrons 14, 10, 12 and 16 or, if one of these cryotrons is driven resistive, through the one of the four lines which is connected in parallel across that gate.

The matrix is initially reset by energizing a reset current source to drive each of the cryotrons R resistive and cause the current from source I to flow directly through gates 14, 10, 12 and 16. Then, a drive line is selected by energizing one of the two current sources A1 and A2 and one of the two current sources B1 and B2 which are connected to selection lines coordinately arranged in the selection matrix. Thus, when A1 and B1 are energized, both control conductors for the gate of cryotron 10 are energized. These control conductors are shown separate for purposes of illustration but are arranged to apply additive fields to the cryotron gate. The design is such that the field of one control conductor is insufficient to drive the gate resistive but the combined field of both is sufficient.

When the gate of 10 is driven resistive the current is shifted into line 1 which forms a complete loop in parallel with this gate and the current flowing through the gates of 12, 14 and 16 is not affected. The advantage of this type of arrangement is that one of a plurality of drive lines is selected for operation by directing current through that line without the necessity of having all of the lines in paralle...