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Gate: A Gate is a simply an electronic circuit which operates on one or more input signals and always produces an output signal. Gates are digital (t wo state) circuits because the input and output signals are either low voltage (0 ) or
Schematic: A drawing of interconnected gates. Net: Wires at the same voltage (electrically connected) Netlist: A list of all the devices and connections in a schematic. Fan-in: The # of inputs to a gate. Fan-out: The # of loads the gate drives. 4.
Boolean algebra and Logic Gates BOOLEAN OPERATIONS AND EXPRESSIONS Variable, complement, and literal are terms used in Boolean algebra. A variable is a symbol used to represent a logical quantity. Any single variable can have a 1 or a 0 value. The complement is the inverse of a variable and is indicated by a bar over variable (overbar).
Logic Gates • digital circuit that either allows a signal to pass through it or not. • Used to build logic functions • There are seven basic logic gates: AND, OR, NOT, NAND (not AND), NOR (not OR), XOR, and XNOR (not XOR) [later] Building Functions: Logic Gates A B Out 0 0 0 0 1 1 1 0 1 1 1 1 A B Out 0 0 0 0 1 0 1 0 0
The basic logic gates are the inverter (or NOT gate), the AND gate, the OR gate and the exclusive-OR gate (XOR). If you put an inverter in front of the AND gate, you get the NAND gate etc. One of the common tool in specifying a gate function is the truth table.
•The easiest gate to analyze is the invert er (NOT) gate. By looking at the inverter we can l tdlbtllthili l ttilearn a great deal about all gate physical implementations. •The Voltage Transfer Characteristic (VTC) of an ideal inverter is: v i Definitions: •V OH =Logic state “1” or “True”. The highest possible output voltage. •V OL
Digital Electronics Fundamental Logic Gates Truth Table Circuit Representation Boolean Expression A B Q A B Q 0 0 0 0 1 0 1 0
A logic gate is a simple electric circuit consisting of two inputs and a single output. The most frequent names for logic gates are AND, OR, NOT, XOR (Exclusive or), NAND (NOT AND), and NOR. An OR logic gate begins with the provision of two electrical inputs.
A major advance that the invention of transistors allowed was the mass production of logic gates, the next building block in microprocessors. Logic gates are circuits that implement the logical AND, OR, NOT and other boolean functions, whose truth tables we studied last week.
A digital circuit is designed for a desired application by a combination of several logic gates. In this unit, we discuss the teaching of the basic concepts of Boolean algebra, different logic gates: AND, OR, NOT, NAND and NOR, and electronic circuits for logic gates.
