GB1199381A – Data Storage Apparatus.
– Google Patents
GB1199381A – Data Storage Apparatus.
– Google Patents
Data Storage Apparatus.
Info
Publication number
GB1199381A
GB1199381A
GB20766/68A
GB2076668A
GB1199381A
GB 1199381 A
GB1199381 A
GB 1199381A
GB 20766/68 A
GB20766/68 A
GB 20766/68A
GB 2076668 A
GB2076668 A
GB 2076668A
GB 1199381 A
GB1199381 A
GB 1199381A
Authority
GB
United Kingdom
Prior art keywords
frequency
bit
group
line
storage element
Prior art date
1968-05-02
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB20766/68A
Inventor
John Brian Gillett
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
International Business Machines Corp
Original Assignee
International Business Machines Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
1968-05-02
Filing date
1968-05-02
Publication date
1970-07-22
1968-05-02
Application filed by International Business Machines Corp
filed
Critical
International Business Machines Corp
1968-05-02
Priority to GB20766/68A
priority
Critical
patent/GB1199381A/en
1969-03-24
Priority to FR6907923A
priority
patent/FR2007627A1/fr
1969-04-24
Priority to DE19691920833
priority
patent/DE1920833C/en
1969-04-30
Priority to US820424A
priority
patent/US3599191A/en
1970-07-22
Publication of GB1199381A
publication
Critical
patent/GB1199381A/en
Status
Expired
legal-status
Critical
Current
Links
Espacenet
Global Dossier
Discuss
Classifications
B—PERFORMING OPERATIONS; TRANSPORTING
B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
B29C37/00—Component parts, details, accessories or auxiliary operations, not covered by group B29C33/00 or B29C35/00
G—PHYSICS
G11—INFORMATION STORAGE
G11C—STATIC STORES
G11C7/00—Arrangements for writing information into, or reading information out from, a digital store
Abstract
1,199,381. Magnetic storage arrangements. INTERNATIONAL BUSINESS MACHINES CORP. 2 May, 1968, No. 20766/68. Heading H3B. To non-destructively read out an anisotropic thin magnetic film storage element 13, Fig. 1, an A.C. of frequency f is applied to a word line 12 so that an A.C. of frequency 2f is induced in a bit line 11 having one of two possible phase positions depending on the digit stored, the capacitive coupled noise which is also developed in the bit line being used as a source of strobe signals to determine the identity of the digit read out. In the storage matrix 10 shown, a decoding tree 15, controlled from word select lines 16 through amplifiers 17, applies A.C. of frequency f to a selected word line 12 for both reading and writing. Further decoding trees 19, each provided for a different group of bit lines 11, are controlled by segment select lines 24 through amplifiers 23, and are effective to connect a selected bit line in a group to a bit driver 20 and a sense amplifier 21. For writing, word and bit drivers 14 and 20 are operative simultaneously, and apply A.C. of frequency f and 2f respectively to a selected storage element in a group, the phase position of the A.C. of frequency 2f from bit driver 20 determining the stable state along the easy axis of magnetization to be established in the storage element. For reading out from a selected element in a group, the appropriate bit line is coupled by the associated decoding tree 19 to the sense amplifier 21, the A.C. of frequency f from the word driver inducing A.C. of frequency 2f in the bit lines. In addition, each bit line of the group picks up capacitive noise of frequency f. The decoding tree passes the A.C. of frequency 2f in the bit line of the selected storage element to the sense amplifier and passes the capacitive noise in all the bit lines of the group to this amplifier. The phase position of the A.C. of frequency 2f is determined by the binary digit stored in the interrogated storage element, and the identity of the digit is determined by the sense amplifier circuit shown in Fig. 4 in which the frequencies f and 2f are segregated by bandpass filters 31 and 32, respectively. The capacitive noise through filter 31 generates strobe pulses of frequency 2f in a strobe 33, the strobe circuit being responsive to each zero of the capacitive noise of frequency f. The strobe pulses control a gate 35, and thus enable the phase position of the A.C. of frequency 2f from the interrogated storage element to be determined by an integrator 36 and threshold switch 37. The decoding trees, Fig. 3, each comprise a branching arrangement of parallel L-C circuits, each circuit being represented in the Figure by a square box. The inductor L of each L-C circuit has an associated control line A, #A … C, and is saturated when its control line is D.C. energized. Each L-C circuit in the decoding tree 14 is resonant at frequency f when unsaturated, and in each decoding tree 19 is resonant at frequency 2f. Thus the associated word or bit driver is operatively connected to the required line by saturating selected L-C circuits in a decoding tree. In the case of the decoding trees 19, since the parallel L-C circuits connected to unselected bit lines have a high impedance at the resonant frequency 2f, but not at frequency f, the capacitive noise in each of the bit lines of a group is able to pass through the decoding tree and therefore act cumulatively in the sense amplifier.
GB20766/68A
1968-05-02
1968-05-02
Data Storage Apparatus.
Expired
GB1199381A
(en)
Priority Applications (4)
Application Number
Priority Date
Filing Date
Title
GB20766/68A
GB1199381A
(en)
1968-05-02
1968-05-02
Data Storage Apparatus.
FR6907923A
FR2007627A1
(en)
1968-05-02
1969-03-24
DE19691920833
DE1920833C
(en)
1968-05-02
1969-04-24
Read arrangement for binary data storage
US820424A
US3599191A
(en)
1968-05-02
1969-04-30
Data storage apparatus
Applications Claiming Priority (1)
Application Number
Priority Date
Filing Date
Title
GB20766/68A
GB1199381A
(en)
1968-05-02
1968-05-02
Data Storage Apparatus.
Publications (1)
Publication Number
Publication Date
GB1199381A
true
GB1199381A
(en)
1970-07-22
Family
ID=10151303
Family Applications (1)
Application Number
Title
Priority Date
Filing Date
GB20766/68A
Expired
GB1199381A
(en)
1968-05-02
1968-05-02
Data Storage Apparatus.
Country Status (3)
Country
Link
US
(1)
US3599191A
(en)
FR
(1)
FR2007627A1
(en)
GB
(1)
GB1199381A
(en)
Families Citing this family (2)
* Cited by examiner, † Cited by third party
Publication number
Priority date
Publication date
Assignee
Title
US3924248A
(en)
*
1974-01-02
1975-12-02
Fuji Electrochemical Co Ltd
Non destructive read out magnetic core memory apparatus having linear hysteresis loop noise cancelling core
US20070076470A1
(en)
*
2005-09-13
2007-04-05
Northern Lights Semiconductor Corp.
Magnetic Random Access Memory Device and Sensing Method Thereof
Family Cites Families (3)
* Cited by examiner, † Cited by third party
Publication number
Priority date
Publication date
Assignee
Title
US3028581A
(en)
*
1959-05-28
1962-04-03
Ibm
Switching device
BE633011A
(en)
*
1962-06-08
US3421153A
(en)
*
1964-07-28
1969-01-07
Sperry Rand Corp
Thin film magnetic memory with parametron driver circuits
1968
1968-05-02
GB
GB20766/68A
patent/GB1199381A/en
not_active
Expired
1969
1969-03-24
FR
FR6907923A
patent/FR2007627A1/fr
not_active
Withdrawn
1969-04-30
US
US820424A
patent/US3599191A/en
not_active
Expired – Lifetime
Also Published As
Publication number
Publication date
US3599191A
(en)
1971-08-10
DE1920833B2
(en)
1973-02-15
DE1920833A1
(en)
1969-11-06
FR2007627A1
(en)
1970-01-09
Similar Documents
Publication
Publication Date
Title
GB754891A
(en)
1956-08-15
Magnetic core memory system
GB1064063A
(en)
1967-04-05
Improvements in digital data storage devices
US2933721A
(en)
1960-04-19
Gated magnetic recording head
GB1199381A
(en)
1970-07-22
Data Storage Apparatus.
GB1227403A
(en)
1971-04-07
US3274570A
(en)
1966-09-20
Time-limited switching for wordorganized memory
NL160961C
(en)
1979-12-17
MAGNETIC DATA RECORDING AND READING DEVICE.
GB1123658A
(en)
1968-08-14
Nondestructive-readout memory device
GB1007222A
(en)
1965-10-13
Search memory using longitudinal steering fields
GB959604A
(en)
1964-06-03
Word selection matrix
US3465312A
(en)
1969-09-02
Balanced bit-sense matrix
US3456246A
(en)
1969-07-15
Plated wire memory
US3422409A
(en)
1969-01-14
Magnetic switch for reading and writing in an ndro memory
US3058100A
(en)
1962-10-09
Magnetic recording and reproducing system
GB1148088A
(en)
1969-04-10
Improvements in or relating to information storage devices
US3209334A
(en)
1965-09-28
Non-destructive read-out memory element
US3231876A
(en)
1966-01-25
Electrical switching means
GB1000246A
(en)
1965-08-04
Memory arrays
US3007011A
(en)
1961-10-31
Magnetic transducing heads
SU378952A1
(en)
1973-04-18
MEMORY DEVICE
US3413622A
(en)
1968-11-26
Drive-sense line with impedance dependent on function
GB1497738A
(en)
1978-01-12
Information transfer
US3290660A
(en)
1966-12-06
Non-destructive sensing semipermanent memory
US3462748A
(en)
1969-08-19
Memory using sense amplifiers with gated feedback
US3408638A
(en)
1968-10-29
Read-write network for content addressable memory
Legal Events
Date
Code
Title
Description
1970-12-02
PS
Patent sealed [section 19, patents act 1949]
1974-11-27
PLNP
Patent lapsed through nonpayment of renewal fees
