GB1080255A - Current driver for writing information into a magnetic core memory system - Google Patents
Current driver for writing information into a magnetic core memory systemInfo
- Publication number
- GB1080255A GB1080255A GB26052/65A GB2605265A GB1080255A GB 1080255 A GB1080255 A GB 1080255A GB 26052/65 A GB26052/65 A GB 26052/65A GB 2605265 A GB2605265 A GB 2605265A GB 1080255 A GB1080255 A GB 1080255A
- Authority
- GB
- United Kingdom
- Prior art keywords
- transistors
- transistor
- current
- voltage
- diodes
- Prior art date
- 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
Links
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/51—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used
- H03K17/56—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices
- H03K17/60—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices the devices being bipolar transistors
- H03K17/64—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices the devices being bipolar transistors having inductive loads
Landscapes
- Read Only Memory (AREA)
Abstract
1,080,255. Transistor switching circuits; circuits employing bi-stable magnetic elements. GENERAL PRECISION Inc. June 21, 1965 [July 20, 1964], No. 26052/65. Headings H3B and H3T. A current driver for a magnetic memory core directs the current from a constant current source selectively in one or other direction through the memory and limits the voltage across the memory during build-up of the current therein. In the circuit shown, to supply a half amplitude pulse to the core X or Y lines connected between 78 and the respective junctions of diodes 36 and 38, one pair of the pairs of transistors 40, 24 and 22, 34 is made conductive according to the required direction of the pulse. The corresponding transistor of an emitter coupled pair 10, 12 is then made conductive and when noise due to the transistor switching has subsided a corresponding one of 26 and 32 is rendered conductive. The base of the conductive one of transistors 10 and 12 is clamped through diode 60 or 62 to the voltage of a Zener diode 58 and, as initially the transistor saturates, this voltage is also applied to the cores. Current builds up until it reaches a value equal to the emitter current of the transistor whereupon the transistor becomes unsaturated and a constant current flows to the cores. Diodes 64 and 67 clamp the emitter voltage of transistors 10 and 12 and diodes 72, 74 and 76 provide a fixed emitter voltage for 26 and 32. Other planes of the core matrix are supplied by further sets of transistors 22, 24, 34, 40 connected to transistors 10, 12, 26, 32 which are common to all planes.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US38378364A | 1964-07-20 | 1964-07-20 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1080255A true GB1080255A (en) | 1967-08-23 |
Family
ID=23514709
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB26052/65A Expired GB1080255A (en) | 1964-07-20 | 1965-06-21 | Current driver for writing information into a magnetic core memory system |
Country Status (2)
Country | Link |
---|---|
FR (1) | FR1442713A (en) |
GB (1) | GB1080255A (en) |
-
1965
- 1965-06-21 GB GB26052/65A patent/GB1080255A/en not_active Expired
- 1965-07-07 FR FR23839A patent/FR1442713A/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
FR1442713A (en) | 1966-06-17 |
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