Digital Systems

Chapter 1

Basic Digital Concepts

OBJECTIVE

In this chapter, we shall learn the concept of a digital circuit and its logic states, ‘1’ and ‘0’. We shall also understand the differences between analog and digital circuits.

BASIC CONCEPTS

1.1 CONCEPTS OF ‘1’s, ‘0’s

An electronic circuit in which a state switches (changes) between two distinct states when there is a change in the input states or conditions is called a digital circuit. A state of a circuit means either a distinct region of output or input voltages or currents or frequencies or phases or conditions of a circuit. One of the regions is represented by a logic ‘true’ or 1 or ‘high’ or ‘yes’ state and the other region is represented by a logic ‘false’ or 0 or ‘low’ or ‘no’ state.