What?

When referring to Digital Circuits, specifically Full Adder, it’s the rippling delays between the input signal and output signal. Obviously, when you combine a bunch of single-bit adders, for example, the delay between a single adder compounds to the full 32 bits.

Delay depends on:

  1. The Tech (The transistor material, capacitance etc.)
  2. The type of gate
  3. Fanning Out
    • If you’re outputting a signal from one gate into many gates, it will obviously take more time than if you were just outputting into a single other gate.

A problem:

What if you’re working with 2 different circuits that have different amounts and types of gates. They would obviously have different delays. (Example below).

Solution:

A Circuit Clock

Formal Definition:

Propagation Delay is the delay between input signal change and output signal change.

Calculate: