GB910765A - Improvements in and relating to logical circuits - Google Patents

Improvements in and relating to logical circuits

Info

Publication number
GB910765A
GB910765A GB449360A GB449360A GB910765A GB 910765 A GB910765 A GB 910765A GB 449360 A GB449360 A GB 449360A GB 449360 A GB449360 A GB 449360A GB 910765 A GB910765 A GB 910765A
Authority
GB
United Kingdom
Prior art keywords
state
core
input
pulse
winding
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
Application number
GB449360A
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.)
Filing date
Publication date
Priority claimed from US792194A external-priority patent/US3063038A/en
Priority claimed from US824021A external-priority patent/US3202831A/en
Application filed by International Business Machines Corp filed Critical International Business Machines Corp
Publication of GB910765A publication Critical patent/GB910765A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K23/00—Pulse counters comprising counting chains; Frequency dividers comprising counting chains
    • H03K23/76—Pulse counters comprising counting chains; Frequency dividers comprising counting chains using magnetic cores or ferro-electric capacitors
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11C—STATIC STORES
    • G11C19/00—Digital stores in which the information is moved stepwise, e.g. shift registers
    • G11C19/02—Digital stores in which the information is moved stepwise, e.g. shift registers using magnetic elements
    • G11C19/04—Digital stores in which the information is moved stepwise, e.g. shift registers using magnetic elements using cores with one aperture or magnetic loop
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K19/00—Logic circuits, i.e. having at least two inputs acting on one output; Inverting circuits
    • H03K19/02—Logic circuits, i.e. having at least two inputs acting on one output; Inverting circuits using specified components
    • H03K19/16—Logic circuits, i.e. having at least two inputs acting on one output; Inverting circuits using specified components using saturable magnetic devices
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K3/00—Circuits for generating electric pulses; Monostable, bistable or multistable circuits
    • H03K3/02—Generators characterised by the type of circuit or by the means used for producing pulses
    • H03K3/45—Generators characterised by the type of circuit or by the means used for producing pulses by the use, as active elements, of non-linear magnetic or dielectric devices

Abstract

910,765. Circuits employing bi-stable magnetic cores. INTERNATIONAL BUSINESS MACHINES CORPORATION. Feb. 9, 1960 [Feb. 9, 1959; June 30, 1959], No. 4493/60. Class 40 (9). A bi-stable core comprises an input winding fed with pulses tending to establish a first remanent state, a condenser charged by the input pulse, discharging at the end of the pulse to tend to establish a second remanent state, the core also having a hold winding coupled to an output winding and operating when the core switches from its second to its first state to maintain the core in its first state after the termination of the input pulse provoking the change. In the binary counter, Fig. 2, all the cores 11 ... 14 are initially in the " O " state. A first positive pulse on the input 16 tends to drive core 11 further into the " O " state and therefore has no effect. The pulse however charges capacitor C 1 which discharges through the winding 11a and resistor R 1 after the pulse ceases. This drives core 11 to the " 1 " state. The resulting output voltage from winding 11b however is of such a voltage as to maintain transistor T 1 (and also diode D 1 ) cut off. The next pulse on input 16, besides charging C 1 restores core 11 to the zero " O " state, the resulting output from winding 11b being such as to charge condenser 11e positively. This enables transistor T 1 to conduct, the collector current through winding 11c being such as to maintain core 11 in the " O " state. The condenser 11e is arranged to have a sufficiently large discharge time to hold transistor T 1 conducting for the whole of the discharge time of condenser C 1 (after the cessation of the second input pulse) thereby preventing the latter from causing core to go to the " 1 " state at this time. It is thus seen that transistor T 1 conducts once for every two input pulses applied to terminals 16. The transistor T 1 serves as the input to a further -2 stage 12 operating in a similar manner; and so on. Output windings 11d. . . 14d may be arranged with suitably poled rectifiers to give outputs either on the change of state of the associated core from 0 to 1 or vice versa. Parallel read-out can be effected by energization of windings 11r ... 14r.
GB449360A 1959-02-09 1960-02-09 Improvements in and relating to logical circuits Expired GB910765A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US792194A US3063038A (en) 1959-02-09 1959-02-09 Magnetic core binary counter
US824021A US3202831A (en) 1959-06-30 1959-06-30 Magnetic core ring circuit

Publications (1)

Publication Number Publication Date
GB910765A true GB910765A (en) 1962-11-21

Family

ID=27121247

Family Applications (1)

Application Number Title Priority Date Filing Date
GB449360A Expired GB910765A (en) 1959-02-09 1960-02-09 Improvements in and relating to logical circuits

Country Status (1)

Country Link
GB (1) GB910765A (en)

Similar Documents

Publication Publication Date Title
US3025411A (en) Drive circuit for a computer memory
US3242352A (en) Chopper circuits
US3181006A (en) Circuit arrangement for the counting stages of a ring counter
US2794130A (en) Magnetic core circuits
US3063038A (en) Magnetic core binary counter
GB961846A (en) Timing circuit for defining long intervals of time
GB910765A (en) Improvements in and relating to logical circuits
US3800168A (en) Synchronized time delay circuit
US3193693A (en) Pulse generating circuit
US2903601A (en) Transistor-magnetic core relay complementing flip flop
US2889510A (en) Two terminal monostable transistor switch
GB1177408A (en) Storage Battery
US2968797A (en) Magnetic core binary counter system
GB1323990A (en) Fet inverter circuit
US2861201A (en) Electronic pulse scaling circuits
US3200382A (en) Regenerative switching circuit
US3521079A (en) Driver circuit for latching type ferrite
US3002184A (en) Pulse gating device
GB878304A (en) Improvements in or relating to transistor memory-circuits
GB866148A (en) Improvements in or relating to switching circuits
US3159773A (en) Bi-stable relay circuit
US3089960A (en) Electrical drive circuit
GB898741A (en) Improvements in or relating to bi-stable trigger circuits
US3069662A (en) Low power magnetic core shift register
US3071695A (en) Magnetic core pulse operated counter