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The switching speed of ECL is very high because—
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- it uses positive logic
- it uses negative logic
- it uses high speed transistors
- its transistors remain unsaturated
Correct Option: D
Switching speed is always determined in terms of the access time. During switching any device may take more access time in the saturation region, whereas in the ECL logic as the transistor is prevented from going into the saturation, results in very low access time i.e., high switching speed. Hence alternative (D) is the correct answer.
