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Assertion (A): Emitter - Coupled Logic (ECL) is the fastest of all logic families and used in applications where very high speed is essential. Reason (R): High speed in ECL is because the transistors are used in difference amplifier configuration in which they are never driven into saturation and the storage time is eliminated.

Assertion (A): Emitter - Coupled Logic (ECL) is the fastest of all logic families and used in applications where very high speed is essential. Reason (R): High speed in ECL is because the transistors are used in difference amplifier configuration in which they are never driven into saturation and the storage time is eliminated. Correct Answer Both (A) and (R) are true and (R) is the correct explanation of (A).

Concept:

  • Emitter-coupled-logic (ECL) is a BJT logic family which is generally considered as 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).
  • ECL transistor use differential amplifier configuration as shown:

 

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So, the (Assertion) is correct and ‘R’ is the correct explanation for it.

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