GB1118640A - Transistor logic circuit - Google Patents
Transistor logic circuitInfo
- 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
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
- H03K19/01—Modifications for accelerating switching
- H03K19/013—Modifications for accelerating switching in bipolar transistor circuits
-
- 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
- H03K19/086—Emitter 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).
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)
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)
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 |
-
1965
- 1965-11-03 GB GB4658065A patent/GB1118640A/en not_active Expired
- 1965-11-19 DE DE1965H0057728 patent/DE1299320B/en not_active Withdrawn
- 1965-11-22 FR FR39248A patent/FR1464168A/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
FR1464168A (en) | 1966-12-30 |
DE1299320B (en) | 1969-07-17 |
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