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Browse Prior Art Database

Magnetic Film Memory Sensing

IP.com Disclosure Number: IPCOM000075015D
Original Publication Date: 1971-Jul-01
Included in the Prior Art Database: 2005-Feb-24
Document File: 2 page(s) / 38K

Publishing Venue

IBM

Related People

Smith, KG: AUTHOR [+2]

Abstract

This is an NDRO magnetic film memory, in which data is readout by a multiple pulse word current producing a multiple pulse sense signal Vs, utilizing a sensing system, wherein read noise components are canceled before application to a phase detector and wherein the phase of the sense signal Vs is compared with that of a reference signal r.

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Magnetic Film Memory Sensing

This is an NDRO magnetic film memory, in which data is readout by a multiple pulse word current producing a multiple pulse sense signal Vs, utilizing a sensing system, wherein read noise components are canceled before application to a phase detector and wherein the phase of the sense signal Vs is compared with that of a reference signal r.

A read pulse on one of word lines 10 produces in each of bit lines 12 a signal Vs, which may be either a "1" signal or a "0" signal, in 1 reference line a 1 reference signal V1 and read noise Vn, and in 0 reference line a 0 reference signal V0 and read noise Vn. Bit lines 12 and 1 and 0 reference lines, which are dummy lines located preferably near bit lines 12, are disposed on magnetic thin film 11, e.g., a permalloy film. One of the bit lines 12 is selected by select circuit 14 and the signal Vs and read noise Vn from the selected line is applied to a first multiplication circuit 16, wherein the signal Vs and read noise Vn are multiplied by 2 to produce at the output thereof signals 2Vs and 2Vn, which are applied to a first input of a first subtraction circuit 18. Signal V1 and read noise Vn from 1 reference line are applied to a first input of addition circuit 20, and signal V0 and read noise Vn from 0 reference line are applied to a second input of addition circuit 20. A signal 2Vn, produced at the output of addition circuit 20 is applied to a second input of subtraction circuit 18. Signal V1 an...