GB1228491A - - Google Patents
Info
- Publication number
- GB1228491A GB1228491A GB1228491DA GB1228491A GB 1228491 A GB1228491 A GB 1228491A GB 1228491D A GB1228491D A GB 1228491DA GB 1228491 A GB1228491 A GB 1228491A
- Authority
- GB
- United Kingdom
- Prior art keywords
- transistor
- value
- transistors
- base
- voltage divider
- 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
- H03K19/02—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)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- Computing Systems (AREA)
- General Engineering & Computer Science (AREA)
- Mathematical Physics (AREA)
- Amplifiers (AREA)
- Logic Circuits (AREA)
Abstract
1,228,491. Transistor logic circuits. MULLARD Ltd. 19 April, 1968, No. 18676/68. Heading H3T. A logic circuit has two or more input emitter follower transistors T 3 , T 4 , T 5 connected to the base of a first transistor T 1 of a current switching pair and the common collector potential supplied as a reference voltage for the base of the second transistor T 2 of the switch. In Fig. 1, if any of the inputs to transistors has a logical value 0 then the current shown as I C is the result of both transistors T 1 and T 2 conducting, whereas only T 2 conducts if an input has a logic value 1. The output is taken from the collector of transistor T 2 . Diode V D enables a reduction in the value of resistor R 1 thus increasing the gain and hence the value of negative feed-back. In a modification (Figs 2 and 3, not shown), a further transistor (T 6 ) is emitter coupled to T 3 -T 5 , its base potential being derived from a voltage divider across the supply, or from a voltage divider connected between the collectors of T 1 and T 2 .
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1867668 | 1968-04-19 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1228491A true GB1228491A (en) | 1971-04-15 |
Family
ID=10116514
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1228491D Expired GB1228491A (en) | 1968-04-19 | 1968-04-19 |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB1228491A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0183464A2 (en) * | 1984-11-19 | 1986-06-04 | Advanced Micro Devices, Inc. | Emitter-coupled logic (ECL) circuits |
| US4651033A (en) * | 1983-01-31 | 1987-03-17 | Fujitsu Limited | Device for complementary input signals using two circuits with different threshold voltages |
| US4757216A (en) * | 1985-12-20 | 1988-07-12 | Nec Corporation | Logic circuit for selective performance of logical functions |
-
1968
- 1968-04-19 GB GB1228491D patent/GB1228491A/en not_active Expired
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4651033A (en) * | 1983-01-31 | 1987-03-17 | Fujitsu Limited | Device for complementary input signals using two circuits with different threshold voltages |
| EP0183464A2 (en) * | 1984-11-19 | 1986-06-04 | Advanced Micro Devices, Inc. | Emitter-coupled logic (ECL) circuits |
| EP0183464A3 (en) * | 1984-11-19 | 1988-01-07 | Advanced Micro Devices, Inc. | Emitter-coupled logic (ecl) circuits |
| US4757216A (en) * | 1985-12-20 | 1988-07-12 | Nec Corporation | Logic circuit for selective performance of logical functions |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed | ||
| PLNP | Patent lapsed through nonpayment of renewal fees |