Question

Propagation delay is defined as __________

(a) the time taken for the output of a gate to change after the inputs have changed

(b) the time taken for the input of a gate to change after the outputs have changed

(c) the time taken for the input of a gate to change after the intermediates have changed

(d) the time taken for the output of a gate to change after the intermediates have changed

I had been asked this question by my college director while I was bunking the class.

This key question is from Digital Integrated Circuits in division Boolean Algebra and Minimization Techniques and Logic Gates of Digital Circuits

Answer 1

Right answer is (a) the time taken for the output of a gate to change after the inputs have changed

To elaborate: Propagation delay is defined as the time taken for the output of a gate to change after the inputs have changed.