Topic: Digital Circuits
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
Answer: B. The transistors are not saturated when conducting
Explanation: Emitter-Coupled Logic (ECL) is the fastest logic family because its transistors are biased to operate in the active region, rather than saturation. This eliminates storage time delays that occur when bringing a transistor out of deep saturation.