Browse Prior Art Database

Switching Arrangement

IP.com Disclosure Number: IPCOM000090797D
Original Publication Date: 1969-Jul-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 38K

Publishing Venue

IBM

Related People

Daughton, JM: AUTHOR [+2]

Abstract

Selection of a desired line or terminal in, for example, a 2.5D organized magnetic film memory, is performed by using a magnetic film gateable transformer 10. This includes conductors 12 and 14 sandwiched between nickel iron films 16 and 18 as in drawing A. Inductive coupling between conductors 12 and 14 is varied by applying from bias line 20 a hard axis magnetic field, at least equal to H(k), to magnetic films 16 and 18 having an easy axis parallel to the direction of line 20. Insulating layers 22, 24, 26, and 28, which can be SiO layers, are provided to separate the conductors 12, 14, and 20 from each other and from ground plane 30.

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Switching Arrangement

Selection of a desired line or terminal in, for example, a 2.5D organized magnetic film memory, is performed by using a magnetic film gateable transformer 10. This includes conductors 12 and 14 sandwiched between nickel iron films 16 and 18 as in drawing A. Inductive coupling between conductors 12 and 14 is varied by applying from bias line 20 a hard axis magnetic field, at least equal to H(k), to magnetic films 16 and 18 having an easy axis parallel to the direction of line 20. Insulating layers 22, 24, 26, and 28, which can be SiO layers, are provided to separate the conductors 12, 14, and 20 from each other and from ground plane 30.

To interconnect bit driver and sense amplifier circuit 32 and terminal 34, magnetic film gateable transformer 10A has applied to it a hard axis magnetic field by bias source 36 as in drawing B. The hard axis field causes the magnetic films of transformer 10A to have a high permeability, approximately 10/3/, in the easy direction. The hysteresis loop of the films is thin and very steep and conductors 12A and 14A passing between the films become closely coupled. In the absence of a hard axis field applied to transformer 10E, conductors 12B and 14B, passing between the films of transformer 10B, are poorly coupled since the magnetization of the films along the easy axis is characterized by a generally rectangular hysteresis loop. Gateable series impedance 38 is provided in line 12B to prevent grounding conductor 1...