Question

The key to propagation delay in bipolar logic family is to prevent the transistors in a gate from ___________

(a) Fan-in

(b) Fan-out

(c) Saturation

(d) Cut-off

This question was posed to me in homework.

I want to ask this question from Compatibility or Interfacing in division Logic Families of Digital Circuits

Answer 1

The correct option is (c) Saturation

The best I can explain: The key to propagation delay in bipolar logic family is to prevent the transistors in a gate from saturation. In Saturation mode, the transistor is in “ON”mode, where it seems like a short circuit between collector and emitter.