ECL Logic Explained | ECL OR and NOR gate explained

In this video, what is ECL Logic, the advantages of ECL logic, the applications of ECL logic, the basic working principle of ECL logic gate is explained in detail.

The following topics are discussed in the video:
0:00 Introduction to ECL Logic
1:11 Advantages of ECL Logic and its applications
2:38 Basic Element of ECL Logic: The current Steering Switch
11:41 The working of 10k series ECL OR/ NOR gate

For more information about the different Logic Family, check this playlist:
   • Logic Family (Digital Electronics)  

ECL Logic (Emitter Coupled Logic)

The ECL logic (Emitter coupled Logic) is one of the fastest logic among the different digital logic families. It is Bipolar Junction Transistor based logic. But unlike the TTL logic, it is non-saturated logic. And the logic swing (the difference between the Logic ‘0’ and logic ‘1’ ) is very small. Because of lower voltage swing and being non-saturated logic, the ECL logic is one of the fastest logic.
The early ECL Logic gates were using the negative power supply. Because of the negative power supply, the output of the ECL gate was immune to the variation in the power supply line.
The basic element of the ECL logic is the current steering switch, which is typically designed using the differential pair.
Because of the differential pair, the ECL logic gate inherently rejects the common mode noise efficiently.

Applications:
Clock distribution System, High-Speed data communication systems

Advantages:
1) Higher Switching Speed
2) When used with negative power supply, it is immune to power supply fluctuations
3) Effectively rejects the common mode noise
4) High Fanout
5) Current Transients due to switching does not occur in ECL (as total current drawn from the sypply remains almost constant)

Disadvantages:
Lower Noise Margin
Higher Power consumption

In this video, the working of the basic element of the ECL Logic (the current steering switch) is explained. And at the later part of the video, the working of the ECL OR / NOR gate is explained in detail.

For more information about the ECL Logic gate, as a reference you can use the following book:
(Just check the tagged product for more detail)
Book:Microelectronic Circuits by Sedra/Smith (7th Edition)
Chapter 15: Advanced Topics in Digital Integrated Circuit Design

This video will be helpful to all the students of science and engineering in understanding the basics of the ECL gate, its advantages and disadvantages, and the basic working principle of the ECL gate.

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#digitalelectronics
#logicfamily
#ECLLogic


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