GB748546A - Electrical calculating circuits employing transistors - Google Patents

Electrical calculating circuits employing transistors

Info

Publication number
GB748546A
GB748546A GB19063/52A GB1906352A GB748546A GB 748546 A GB748546 A GB 748546A GB 19063/52 A GB19063/52 A GB 19063/52A GB 1906352 A GB1906352 A GB 1906352A GB 748546 A GB748546 A GB 748546A
Authority
GB
United Kingdom
Prior art keywords
transistor
point
diode
current
signal
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
GB19063/52A
Inventor
Frederic Calland Williams
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.)
National Research Development Corp UK
Original Assignee
National Research Development Corp UK
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 to FR1086474D priority Critical patent/FR1086474A/fr
Application filed by National Research Development Corp UK filed Critical National Research Development Corp UK
Priority to GB19063/52A priority patent/GB748546A/en
Priority to DEN7511A priority patent/DE1086923B/en
Priority to US375265A priority patent/US2895673A/en
Publication of GB748546A publication Critical patent/GB748546A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F7/00—Methods or arrangements for processing data by operating upon the order or content of the data handled
    • G06F7/38—Methods or arrangements for performing computations using exclusively denominational number representation, e.g. using binary, ternary, decimal representation
    • G06F7/48—Methods or arrangements for performing computations using exclusively denominational number representation, e.g. using binary, ternary, decimal representation using non-contact-making devices, e.g. tube, solid state device; using unspecified devices
    • G06F7/50—Adding; Subtracting
    • G06F7/501—Half or full adders, i.e. basic adder cells for one denomination
    • G06F7/5013—Half or full adders, i.e. basic adder cells for one denomination using algebraic addition of the input signals, e.g. Kirchhoff adders
    • 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
    • H03K19/08—Logic circuits, i.e. having at least two inputs acting on one output; Inverting circuits using specified components using semiconductor devices
    • H03K19/082—Logic circuits, i.e. having at least two inputs acting on one output; Inverting circuits using specified components using semiconductor devices using bipolar transistors
    • H03K19/084—Diode-transistor logic

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Pure & Applied Mathematics (AREA)
  • Mathematical Analysis (AREA)
  • Mathematical Optimization (AREA)
  • Mathematical Physics (AREA)
  • Computational Mathematics (AREA)
  • Computing Systems (AREA)
  • General Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Algebra (AREA)
  • Power Engineering (AREA)
  • Computer Hardware Design (AREA)
  • Electronic Switches (AREA)
  • Logic Circuits (AREA)

Abstract

748,546. Digital electric calculating-apparatus. NATIONAL RESEARCH DEVELOPMENT CORPORATION. July 13, 1953 [July 28, 1952], No. 19063/52. Class 106 (1). An adding circuit for producing " sum " and " carry digit signals in response to three binary digit signals A, B. and CD which are first combined to form a signal having four possible magnitudes, comprises an arrangement of transistors. The input signals A, B and CD are applied to the left-hand diodes of three double-diodes D6, D7; D8, D9 and D10, D11. A signal of - 2 volts represents binary " 0 " and +2 volts represents binary " 1 ". The effect of a binary " 1 " signal is to change over the 2 MA (one unit) of current flow from the lefthand to the right-hand diode of the doublediode concerned. One unit of current passing through the emitter El of transistor T1 will cause the transistor to trigger on in the manner described in Specification 747,606, " bottoming " on the knee of the characteristic curve, and an output signal will be obtainable at the point S. The changing over of two of the double-diodes provides two units of current at the common point P of the two emitters El, E2. Since the transistor T1 is unable to absorb this amount of current, the voltage at the point P rises by an amount sufficient to trigger the transistor T2, the point B2 of which moves from a potential of +1 volt, held by a diode D2, to a potential of - 1 volt, hold by a diode D3. This cuts-off the transistor T1 in which B1 is held at 0 volt by a diode D1. When signals appear on all three lines A, B and CD simultaneously, the three doublediodes D6, D7; D8, D9 and D10, D11 are changed over and the three units of current appearing at the point P is sufficient to cause both transistors T1 and T2 to be triggered on simultaneously. The output at C will normally be fed to the input CD of an adding circuit in the next higher denomination or through a delay circuit back to the lead CD shown. Means for bringing the output at C to the correct voltages for this purpose are described (Fig. 3, not shown).
GB19063/52A 1952-07-28 1952-07-28 Electrical calculating circuits employing transistors Expired GB748546A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
FR1086474D FR1086474A (en) 1952-07-28
GB19063/52A GB748546A (en) 1952-07-28 1952-07-28 Electrical calculating circuits employing transistors
DEN7511A DE1086923B (en) 1952-07-28 1953-07-23 Binary adder for electronic computing systems and data processing machines
US375265A US2895673A (en) 1952-07-28 1953-07-24 Transistor binary adder

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB19063/52A GB748546A (en) 1952-07-28 1952-07-28 Electrical calculating circuits employing transistors

Publications (1)

Publication Number Publication Date
GB748546A true GB748546A (en) 1956-05-02

Family

ID=10123151

Family Applications (1)

Application Number Title Priority Date Filing Date
GB19063/52A Expired GB748546A (en) 1952-07-28 1952-07-28 Electrical calculating circuits employing transistors

Country Status (4)

Country Link
US (1) US2895673A (en)
DE (1) DE1086923B (en)
FR (1) FR1086474A (en)
GB (1) GB748546A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3014663A (en) * 1955-12-28 1961-12-26 Ibm Binary full adders

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL195088A (en) * 1954-02-26
US3047733A (en) * 1957-03-12 1962-07-31 Ibm Multiple output semiconductor logical device
US3077303A (en) * 1958-05-26 1963-02-12 Packard Bell Comp Corp Data converter
US3023965A (en) * 1959-02-27 1962-03-06 Burroughs Corp Semi-conductor adder
US2999637A (en) * 1959-04-29 1961-09-12 Hughes Aircraft Co Transistor majority logic adder

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2453454A (en) * 1946-08-31 1948-11-09 Bell Telephone Labor Inc Coder for code modulation transmission
US2557729A (en) * 1948-07-30 1951-06-19 Eckert Mauchly Comp Corp Impulse responsive network
US2533001A (en) * 1949-04-30 1950-12-05 Rca Corp Flip-flop counter circuit
NL222686A (en) * 1950-11-28
US2712065A (en) * 1951-08-30 1955-06-28 Robert D Elbourn Gate circuitry for electronic computers

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3014663A (en) * 1955-12-28 1961-12-26 Ibm Binary full adders

Also Published As

Publication number Publication date
DE1086923B (en) 1960-08-11
FR1086474A (en)
US2895673A (en) 1959-07-21

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