3010203d Logic Gates Flashcards
What type of signal does a microprocessor use?
Binary signals in the form of 0’s and 1’s and then manipulates them according to the program, which is a set of instructions
What is microprocessor circuitry made up of?
Microprocessor circuitry is made of digital logic gates
What is a digital logic gate?
Digital logic gates are simple electronic circuits that operate as a switch
What is the most common type of switch or logic gate in today’s computers?
The most common type of switch in today’s computers is a transistor called a metal-oxide semiconductor field-effect transistor (MOSFET)
Describe the principal operation of a metal-oxide semiconductor field-effect transistor (MOFSET)
When a voltage is applied to this transistor it reacts by turning the circuit either on or off
A signal at or near the high end of the voltage range switches the circuit on
An incoming signal at or near the low end of the voltage range (zero) switches the circuit off.
Describe the output from an AND operation
Output from an AND operation is true only if all its inputs are true
What are the 3 ways an AND operation is shown in process control or logic diagrams?
Describe the output from an OR operation
Output from an OR operation is true if any of its inputs are true
What are the 3 possible ways that an OR operation is shown in process control or logic diagrams?
Describe the output of a NOT operation
The knot operation takes the value on its input and produces an output that is opposite to the input
If the input is true (1) the output is false (0)
What are 3 possible ways that a NOT operation is shown in process control or logic diagrams
What type of gate is this and what is meant by the bubble on input B?
This is an AND gate
The bubble symbolizes a NOT operation, which indicates an inversion
Describe the output of a NAND gate
The NAND gate is an AND gate, followed by a NOT gate
The output of a NAND gate is 0 (false) only when all the inputs are 1’s (true) which is the inverse of the AND gate
Which gate type is also referred to as the universal gate and why?
The NAND gate is also called the universal gate
The NAND gate is used in integrated circuits because it can be used in combination with other NAND gates to create other gates such as the AND, OR and NOT gates
What type of gate is this
Describe the operation of a NOR gate
The NOR gate is an OR gate, followed by a NOT gate
The output of a NOR gate is one true only when all the inputs are 0 (false) which is the inverse of the OR gate
What type of gate is this
An exclusive-OR (XOR) gate
Describe the operation of an exclusive-OR (XOR) gate
The exclusive-OR (XOR) gate is often used with three basic gates
The output of a 2 input exclusive-OR (XOR) gate is true only when one input or the other is true, but not both
What type of gate is this?
What type of gate is this?
What type of gate is this?
Which gate type cannot have multiple inputs?
The NOT gate
What type of gate is this?
