1. Logic Circuits EG 533EX Course Introduction - Jyoti Tandukar

2. Introduction  Digital electronics is so different from analog that it can be studied separately. Digital systems are built around circuits in which only one of the two states can exist at any given time: ON and OFF, TRUE and FALSE, YES and NO,or 1 and 0.  Digital systems are most suitable for information storing and processing, because information cannot be stored in analog form.

3. Topics Covered  How to convert information into a digital form so that it can be represented by using only two states.  What types of basic circuits are used to manipulate DIGITAL information.  How do you build a digital circuit that meets your operational requirements.

4. Examples of DIGITAL SYSTEMS  Calculators  Personal Computers  Compact Disks (CDs)  Digital Video Disks

5. Advantage  Audio CDs (DIGITAL) have better quality sound reproduction than audio tapes (ANALOG), WHY? Noise Immunity  The main advantage of the digital system is that it is more reliable than analog for transmission over long distances as well as storage of the data (like in the CDs). Furthermore, the process of signal processing and data analysis become more precise and realistic with the digital system.

6. Disadvantage  System complexity that is involved The higher system complexity means more lines of data and sophisticated mechanism of management and control.  Speed of processing Digital processing is a complex process involving many steps thus making the system slower.

7. Two Broad Families  Combinational The result depends upon inputs only e.g., add 2 and 4.  Sequential A memory of previous state is required e.g., count how many times the input is switched ON. CMOS, TTL, ECL, etc. are different technologies used to implement digital circuits.

8. Conclusion Together, we will learn these. Thank You  How to convert information into a digital form so that it can be represented by using only two states.  What types of basic circuits are used to manipulate DIGITAL information.  How do you build a digital circuit that meets your operational requirements.