GB1118640A - Transistor logic circuit - Google Patents

Transistor logic circuit

Info

Publication number
GB1118640A
GB1118640A GB4658065A GB4658065A GB1118640A GB 1118640 A GB1118640 A GB 1118640A GB 4658065 A GB4658065 A GB 4658065A GB 4658065 A GB4658065 A GB 4658065A GB 1118640 A GB1118640 A GB 1118640A
Authority
GB
United Kingdom
Prior art keywords
collector
transistors
voltage
emitter
resistor
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
GB4658065A
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.)
Hitachi Ltd
Original Assignee
Hitachi Ltd
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 Hitachi Ltd filed Critical Hitachi Ltd
Publication of GB1118640A publication Critical patent/GB1118640A/en
Expired legal-status Critical Current

Links

Classifications

    • HELECTRICITY
    • H03ELECTRONIC CIRCUITRY
    • H03KPULSE TECHNIQUE
    • H03K19/00Logic circuits, i.e. having at least two inputs acting on one output; Inverting circuits
    • H03K19/01Modifications for accelerating switching
    • H03K19/013Modifications for accelerating switching in bipolar transistor circuits
    • HELECTRICITY
    • H03ELECTRONIC CIRCUITRY
    • H03KPULSE TECHNIQUE
    • H03K19/00Logic circuits, i.e. having at least two inputs acting on one output; Inverting circuits
    • H03K19/02Logic circuits, i.e. having at least two inputs acting on one output; Inverting circuits using specified components
    • H03K19/08Logic circuits, i.e. having at least two inputs acting on one output; Inverting circuits using specified components using semiconductor devices
    • H03K19/082Logic circuits, i.e. having at least two inputs acting on one output; Inverting circuits using specified components using semiconductor devices using bipolar transistors
    • H03K19/086Emitter coupled logic

Landscapes

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

Abstract

1,118,640. Logic circuits. HITACHI Ltd. 3 Nov., 1965 [21 Nov., 1964; 28 June, 1965], No. 46580/65. Heading H3T. A logic circuit comprises a plurality of transistors having their emitters connected via a common resistor to a power supply point and their collectors via another common resistor to another power supply point, means being provided to detect changes in the collector/emitter voltages and to feed such changes back to the common collectors. Such a circuit provides direct and inverted outputs and can be coupled to one or more succeeding stages. The collector resistor also serves to prevent ringing if the load is capacitative, by feeding back a voltage through the base-collector capacitance when this becomes forward biased. It is arranged that the transistor becomes saturated only on the overshoot of voltage due to ringing, thus preserving fast response. Fig. 3 shows two cascaded AND circuits with extra transistors Tr1 and Tr2 which stabilize the emitter-collector potentials of the logic transistors and thus facilitate the elimination of the ringing. Transistors Tr1 and Tr2 are normally cut off but if the collector voltage at c or c<SP>1</SP> falls or rises emitter current will flow in Tr1 or Tr2 respectively to restore the voltage to its former level. R 1 and R 1 <SP>1</SP> may be replaced by diodes, and R 3 and R 3 <SP>1</SP> may be omitted; stabilization may be improved by a further resistor between the emitter of Tr1 or Tr2 and c or c<SP>1</SP> respectively (Fig. 8, not shown).
GB4658065A 1964-11-21 1965-11-03 Transistor logic circuit Expired GB1118640A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP6571564 1964-11-21
JP3825565 1965-06-28

Publications (1)

Publication Number Publication Date
GB1118640A true GB1118640A (en) 1968-07-03

Family

ID=26377469

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4658065A Expired GB1118640A (en) 1964-11-21 1965-11-03 Transistor logic circuit

Country Status (3)

Country Link
DE (1) DE1299320B (en)
FR (1) FR1464168A (en)
GB (1) GB1118640A (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0683054B2 (en) * 1985-12-20 1994-10-19 日本電気株式会社 Logic level conversion circuit

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2962604A (en) * 1957-07-26 1960-11-29 Westinghouse Electric Corp Logic circuits
DE1065876B (en) * 1957-12-23 1959-09-24 IBM Deutschland Internationale Büro-Maschinen Gesellschaft m.b.H., Sindelfingen (Württ.) Circuit with a transistor and a constant current source
US3058007A (en) * 1958-08-28 1962-10-09 Burroughs Corp Logic diode and class-a operated logic transistor gates in tandem for rapid switching and signal amplification
NL258728A (en) * 1959-12-08

Also Published As

Publication number Publication date
FR1464168A (en) 1966-12-30
DE1299320B (en) 1969-07-17

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