GB1020968A - A logical circuit - Google Patents

A logical circuit

Info

Publication number
GB1020968A
GB1020968A GB4253264A GB4253264A GB1020968A GB 1020968 A GB1020968 A GB 1020968A GB 4253264 A GB4253264 A GB 4253264A GB 4253264 A GB4253264 A GB 4253264A GB 1020968 A GB1020968 A GB 1020968A
Authority
GB
United Kingdom
Prior art keywords
transistor
diode
circuit
transistors
saturating
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
GB4253264A
Inventor
David James Truslove
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
Application filed by International Business Machines Corp filed Critical International Business Machines Corp
Priority to GB4253264A priority Critical patent/GB1020968A/en
Publication of GB1020968A publication Critical patent/GB1020968A/en
Expired legal-status Critical Current

Links

Classifications

    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • Computing Systems (AREA)
  • General Engineering & Computer Science (AREA)
  • Mathematical Physics (AREA)
  • Logic Circuits (AREA)

Abstract

1,020,968. Transistor logic circuits. INTERNATIONAL BUSINESS MACHINES CORPORATION. Oct. 19, 1964, No. 42532/64. Heading H3T. A logic circuit comprises a bridge circuit comprising, between the input terminals 5, 6, two diode arms 12 and 13 in series and two emitter-base diode arms 14 and 15 in series, a resistor 11 being connected across the other diagonal 9, 10. In the circuit shown, when the signals at 5 and 6 are equal no current flows in the transistors 14 and 15 so that transistor 19 is conducting. When 5 is positive with respect to 6, current flows in the path 12, 11, 15 so that transistor 15 conducts and 19 is cut off. Similarly, transistor 19 conducts when 6 is positive with respect to 5. Accordingly, the circuit performs an " exclusive OR " function. Diode 23 prevents transistors 14 and 15 saturating and diode 24 prevents 19 saturating. In addition, the charge stored in diodes 12 and 13, when conducting, provide a discharge path for charge stored by the transistors 15 and 16, respectively when the signal terminates. Fig. 1 (not shown) is a simplified circuit having the diodes and emitter-base paths reversed.
GB4253264A 1964-10-19 1964-10-19 A logical circuit Expired GB1020968A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB4253264A GB1020968A (en) 1964-10-19 1964-10-19 A logical circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB4253264A GB1020968A (en) 1964-10-19 1964-10-19 A logical circuit

Publications (1)

Publication Number Publication Date
GB1020968A true GB1020968A (en) 1966-02-23

Family

ID=10424836

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4253264A Expired GB1020968A (en) 1964-10-19 1964-10-19 A logical circuit

Country Status (1)

Country Link
GB (1) GB1020968A (en)

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