Question

For emitter coupled logic the switching speed is very high because

• A. negative logic is used
• B. the transistors are not saturated when conducting
• C. emitter coupled transistor are used
• D. multi emitter transistors are used

Hint:

ECL is fastest because it avoids transistor saturation delay.

Answer 1

The Correct Option is B

Concept: Emitter Coupled Logic (ECL) is a high-speed logic family.

Step 1: Key feature Transistors operate in active region.

Step 2: No saturation Avoids storage delay associated with saturation.

Step 3: Switching speed Faster transitions between states.

Step 4: Comparison TTL suffers delay due to saturation.

Step 5: Conclusion \[ \boxed{\text{Transistors are not saturated}} \]

Final Answer: \[ \boxed{(B)} \]