What is ECL circuit?

What is ECL circuit?

In electronics, emitter-coupled logic (ECL) is a high-speed integrated circuit bipolar transistor logic family. As the current is steered between two legs of an emitter-coupled pair, ECL is sometimes called current-steering logic (CSL), current-mode logic (CML) or current-switch emitter-follower (CSEF) logic.

Why ECL is fastest logic family?

Emitter-coupled-logic (ECL) is a BJT logic family that is generally considered the fastest logic available. ECL achieves its high-speed operation by employing a relatively small voltage swing and preventing the transistors from entering the saturation region. (Reduces the storage delay time).

What are the advantages of ECL logic?

Following points summarize ECL advantages over TTL and CMOS: ➨It has fanout of 25 which is better than TTL and less then CMOS. ➨It has average propagation delay time ( 1 to 4 ns ) better compare to both TTL and CMOS. Hence it is known as fastest logic family.

Why ECL is called emitter coupled logic explain the working of ECL as NOR or logic gates?

Two input ECL OR/NOR gate The following circuit is the Emitter-coupled logic circuit of the 2-input OR/NOR gate. It corresponds to the OR gate output. Similarly, if both the input of transistors Q1 and Q2 are HIGH, it will turn on both the transistors. It will drive the output at terminal VOUT1 to be LOW.

What is the full form of ECL?

ECL Definition ECL stands for Emitter-Coupled Logic. ECL is an integrated BJT circuit. ECL is often called the current-mode logic (CML) or the current-steering logic (CSL) or also the current-switch emitter-follower (CSEF) logic.

What is ECL and TTL?

These are logic familities used in IC (Integrated Circuit) designs. TTL (Transistor Transistor Logic) IC technology uses bipolar transistor as principal circuit element. ECL (Emitter Coupled Logic) IC technology uses bipolar transistors configured as differential amplifier.

Why ECL has least propagation delay?

Reason (R): ECL prevents adverse effects of diffusion capacitance as it does not operate fully saturated or cut off.

Which is faster ECL or CMOS?

ECL | Emitter Coupled Logic ECL is based on use of current steering switch realised using differential transistor pair. ECL eliminates saturation and improves speed but uses more power than other logic families such as TTL and CMOS. ECL gates provide both true as well as complemented outputs.

How can ECL have both a NOR and an OR output?

How can ECL have both a NOR and an OR output? ECL does not have this feature. They are simply the inverse of each other.

What is the fan out capability of ECL?

Fan-out is the measure of the maximum number of inputs that a single gate output can accept. Explanation: ECL’s major disadvantage is that each gate continuously draws current, which means it requires (and dissipates) significantly more power than those of other logic families.

What is the major advantage of ECL logic Mcq?

A major advantage of ECL logic over TTL and CMOS is ________….Exercise :: Logic Gates – Filling the Blanks.

A. low power dissipation
B. high speed
C. both low power dissipation and high speed
D. neither low power dissipation nor high speed

How many areas are in ECL?

As of 2017, Eastern Coalfields had 14 operating areas with 87 working mines, 60 being underground mines, 19 open cast and 8 mixed mines.