GB1214024A – Magnetic thin film memory
– Google Patents
GB1214024A – Magnetic thin film memory
– Google Patents
Magnetic thin film memory
Info
Publication number
GB1214024A
GB1214024A
GB3741268A
GB3741268A
GB1214024A
GB 1214024 A
GB1214024 A
GB 1214024A
GB 3741268 A
GB3741268 A
GB 3741268A
GB 3741268 A
GB3741268 A
GB 3741268A
GB 1214024 A
GB1214024 A
GB 1214024A
Authority
GB
United Kingdom
Prior art keywords
word
bias
lines
bit
line
Prior art date
1968-08-06
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
GB3741268A
Inventor
John Gilbert Axford
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.)
1968-08-06
Filing date
1968-08-06
Publication date
1970-11-25
1968-08-06
Application filed by International Business Machines Corp
filed
Critical
International Business Machines Corp
1968-08-06
Priority to GB3741268A
priority
Critical
patent/GB1214024A/en
1969-07-08
Priority to FR6923614A
priority
patent/FR2015123A1/fr
1969-07-31
Priority to DE19691938915
priority
patent/DE1938915A1/en
1970-11-25
Publication of GB1214024A
publication
Critical
patent/GB1214024A/en
Status
Expired
legal-status
Critical
Current
Links
Espacenet
Global Dossier
Discuss
Classifications
G—PHYSICS
G07—CHECKING-DEVICES
G07F—COIN-FREED OR LIKE APPARATUS
G07F13/00—Coin-freed apparatus for controlling dispensing or fluids, semiliquids or granular material from reservoirs
G07F13/02—Coin-freed apparatus for controlling dispensing or fluids, semiliquids or granular material from reservoirs by volume
G—PHYSICS
G11—INFORMATION STORAGE
G11C—STATIC STORES
G11C11/00—Digital stores characterised by the use of particular electric or magnetic storage elements; Storage elements therefor
G11C11/02—Digital stores characterised by the use of particular electric or magnetic storage elements; Storage elements therefor using magnetic elements
G11C11/14—Digital stores characterised by the use of particular electric or magnetic storage elements; Storage elements therefor using magnetic elements using thin-film elements
Abstract
1,214,024. Circuits employing bi-stable magnetic elements. INTERNATIONAL BUSINESS MACHINES CORP. 6 Aug., 1968, No. 37412/68. Heading H3B. In a magnetic thin film memory information is read out of a word by applying an oscillatory active signal of frequency # together with a biasing magnetic field to the elements of a word and detecting the phase of signals at frequency # produced in the associated bit lines. The memory of Fig. 2 comprises in groups 10a, 10b to 10m each of which is an N x n array of anisotropic thin films and includes n bit lines 11 each extending along a respective row of elements and a single bias line 12 extending along all the columns of elements in the group for simultaneously applying a hard axis bias field. To effect read out of data from a word storage location an oscillatory drive signal is supplied by word drive circuit 14 to the word line coupled to the required word storage location and a bias signal applied simultaneously to the bias line 12 of the group in which the required storage location is located. A sense signal is developed in all of the sense/bit lines 11 of the memory but only the bit lines of the group to which the bias current is applied have a significant component at the fundamental frequency # of the sinusoidal drive signal. The signals at the fundamental frequency are passed by filters 23 to phase detectors 24 and the signals developed on output lines 25 are indicative of the data stored, Fig. 3 (not shown). Information is stored by applying bit currents to selected bit/sense lines of the required polarity simultaneously with the oscillatory word drive signal and bias field applied to a selected word line, Fig. 4. As shown all the diodes 27 of each segment are connected to a respective control line 29 and all diodes 28 are connected to control line 30. In order to select the bit lines of a respective group for the storage of information control lines 29, 30 are both connected to ground potential, control lines 29, 30 of unselected segments being connected to negative and positive potentials respectively. Resistors 31 and capacitors 32 present an open circuit to the bit currents but provide a resonable termination at the high frequencies of the sense signals during reacting. The oscillatory drive signals may be applied to the bias lines and the D.C. bias signal applied to the word lines. The hard axis bias field may be provided by field windings or coils surrounding respective segments of the memory instead of a bias line.
GB3741268A
1968-08-06
1968-08-06
Magnetic thin film memory
Expired
GB1214024A
(en)
Priority Applications (3)
Application Number
Priority Date
Filing Date
Title
GB3741268A
GB1214024A
(en)
1968-08-06
1968-08-06
Magnetic thin film memory
FR6923614A
FR2015123A1
(en)
1968-08-06
1969-07-08
DE19691938915
DE1938915A1
(en)
1968-08-06
1969-07-31
Magnetic thin-film storage
Applications Claiming Priority (1)
Application Number
Priority Date
Filing Date
Title
GB3741268A
GB1214024A
(en)
1968-08-06
1968-08-06
Magnetic thin film memory
Publications (1)
Publication Number
Publication Date
GB1214024A
true
GB1214024A
(en)
1970-11-25
Family
ID=10396294
Family Applications (1)
Application Number
Title
Priority Date
Filing Date
GB3741268A
Expired
GB1214024A
(en)
1968-08-06
1968-08-06
Magnetic thin film memory
Country Status (3)
Country
Link
DE
(1)
DE1938915A1
(en)
FR
(1)
FR2015123A1
(en)
GB
(1)
GB1214024A
(en)
Families Citing this family (1)
* Cited by examiner, † Cited by third party
Publication number
Priority date
Publication date
Assignee
Title
DE10148728C1
(en)
2001-10-02
2003-05-15
Schmitz Gotha Fahrzeugwerke
Locking arrangement for containers
1968
1968-08-06
GB
GB3741268A
patent/GB1214024A/en
not_active
Expired
1969
1969-07-08
FR
FR6923614A
patent/FR2015123A1/fr
not_active
Withdrawn
1969-07-31
DE
DE19691938915
patent/DE1938915A1/en
active
Pending
Also Published As
Publication number
Publication date
DE1938915A1
(en)
1970-02-12
FR2015123A1
(en)
1970-04-24
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Legal Events
Date
Code
Title
Description
1971-05-19
PS
Patent sealed
1975-03-05
PLNP
Patent lapsed through nonpayment of renewal fees
