Digital Logic 1/Digital Signals and Logic Symbols

=Basic Ideas and Concepts=
 * Learn what is referred to as a "digital" circuit
 * Learn the respective logic gates and symbols associated
 * Learn the functionality of each logic gate

=Digitization= When we say we have a "digital" circuit, it means that we create an entire new domain that is purely represented by an analog signal. What that means is, referring back to our basic circuit of a voltage source and a resistor, we can say that the different voltage levels can represent a "low" or "high". Using electrical and computer engineering conventions, we classify a logic "high" as anywhere from 4.5 volts to 5.0 volts and a logic "low" as anywhere from 0.1 to 0.5 volts.

So basically, we say that a 0 is inputted when the voltage is between 0.1-0.5 volts and a 1 if the voltage is 4.5-5 volts. Ideally however, we want 0.0 and 5.0 volts to represent 0 and 1 respectively and pictorially is represented below.

With this in mind, we can now move on and discuss logic gates which form the foundation of combinational circuits and analysis.

=Logic Gates= Below are all the different logic symbols that are used to design and implement digital circuits.