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Film Bit Sense System with Fast Recovery Properties

IP.com Disclosure Number: IPCOM000090209D
Original Publication Date: 1969-Mar-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 33K

Publishing Venue

IBM

Related People

Taren, WJ: AUTHOR [+2]

Abstract

Current spreading in ground plane 10 of 2-D magnetic film memories can be reduced by using a common bit sense line 12 driven at opposite ends by unipolar drivers 14 and 16. Bit line 12 is folded back upon itself so that opposite halves 12a and 12b lie alongside of each other and in close proximity to one another and to plane 10. Therefore, when a current pulse from either the 0-bit driver 14 or the 1-bit driver 16 travels through bit line 12 it is transmitted in opposite directions through halves 12a and 12b. Thus, image currents of halves 12a and 12b balance out in plane 10 so that no net current flows in such plane. Magnetic bits 18 for the memory are arranged in pairs on the sense line 12 with a separate word line 20 addressing each pair of magnetic bits.

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Film Bit Sense System with Fast Recovery Properties

Current spreading in ground plane 10 of 2-D magnetic film memories can be reduced by using a common bit sense line 12 driven at opposite ends by unipolar drivers 14 and 16. Bit line 12 is folded back upon itself so that opposite halves 12a and 12b lie alongside of each other and in close proximity to one another and to plane 10. Therefore, when a current pulse from either the 0-bit driver 14 or the 1-bit driver 16 travels through bit line 12 it is transmitted in opposite directions through halves 12a and 12b. Thus, image currents of halves 12a and 12b balance out in plane 10 so that no net current flows in such plane. Magnetic bits 18 for the memory are arranged in pairs on the sense line 12 with a separate word line 20 addressing each pair of magnetic bits. In this arrangement, each pair of magnetic bits 18 constitutes a single bit of storage which is addressed for reading and writing by selective energization of the proper bit and word driver. Data read from bits 18 is sensed by differential sense amplifier 22 connected across termination resistors 24 for the bit line 12.

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