Digital Computers Chapter 1 Logic Design deals with

Digital Computers Chapter 1: Logic Design deals with the basic concepts and tools used to design digital hardware consisting of logic circuits. Computer Design deals with the additional concepts and tools used to design computers and other complex digital hardware. Computers and digital hardware in general are referred to as digital systems. Characteristics of a digital system is the manipulation of discrete elements of information. Any set that is restricted to a finite number of elements contains discrete information. Examples of discrete sets are the 10 decimal digits, the 26 letters of the alphabet etc. Discrete elements of information are represented in a digital system by physical quantities called signals. Electrical signals such as voltages and currents are most common. Transistors dominate the circuitry that implements these signals. Signals in most present day electronic digitals systems ase just two discrete values and are therefore said to be binary. Orange Boxes include information not in your text A Bipolar Transistor is a 3 terminal semiconductor sevice in which a small current at one terminal can control a much larger current flowing between the 2 nd and 3 rd terminal. Transistors can function both as amplifiers ans switches. +5 V R 2 1 K Hi Off Hi On A 10 K LED Lo B Out A +5 V 10 K S 1 LED Lo R 1 1 K +5 V And Gate B +5 V Out +5 V 4. 7 K +5 V