AND-OR gates?

Question

Hi can anyone tell me what AND-OR gates are plz?

thnx in advance

thnx for all your answers..

basically i know what AND is and what OR is... i dont understand what AND-OR is..

thnx

Answer 1

It's simple, the simplest AND-OR gate will have 2 AND gates with 2 inputs each. the outputs of the AND gates will then be applied to an Or gate. The effect is that the output will only be high when both inputs to at least one of the AND gates are high. In Booleanese,

AB + CD

Answer 2

here is the truth table

AND

a b (a and b)
0 0 0
0 1 0
1 0 0
1 1 1


OR

a b (a or b)
0 0 0
0 1 1
1 0 1
1 1 1

So basically for AND both a and b must work but for OR either a or b should be 1 or HIGH. If both are LOW or 0 the output for OR gate is LOW/0

Answer 3

It's simple, the simplest AND-OR gate will have 2 AND gates with 2 inputs each. the outputs of the AND gates will then be applied to an Or gate. The effect is that the output will only be high when both inputs to at least one of the AND gates are high. In Booleanese,

AB + CD

Answer 4

They are called logic gates and they are electronic gates that perform basic logic operations (AND and OR).
Here's from wiki:

A logic gate is a combination of different electronic components, that takes one or more logic-level inputs and produces a single logic-level output. Because the output is also a logic-level value, an output of one logic gate can connect to the input of one or more other logic gates.

In electronic logic, a logic level is represented by a certain voltage (which depends on the type of electronic logic in use). Each logic gate requires power so that it can source and sink currents to achieve the correct output voltage. In logic circuit diagrams the power is not shown, but in a full electronic schematic, power connections are required. There are 7 positive logic gates and each gate has two laws or rules.

Answer 5

An and-or gate will give 1 if either or both of the inputs are at 1. It will only give 0 if both of the inputs are 0. It's like an or gate but it also gives 1 when both inputs are 1.

Answer 6

AND OR gates: depending on how you are relating the term I can think of two meanings.

1.) a combination of using individual AND's with individual OR's to create a complex logic circuit (A*B)+(C*D)


2.)AND-OR relate to POS-NEG logic and term could appear on a circuit diagram of a gate to indicate the operation based upon logic polarity.
depending on the polarity of your logic convention (positive logic vs negative logic)

Positive Logic 1(voltage present) = high : 0 ( no voltage)
Negative Logic 0 = high (no voltage) : 0 = Low (voltage present)

Each gate has an opposite version of itself when dealing with its opposite logic type.

So and AND gate works like an AND gate in positive logic but this POS AND circuit will work like an OR in negative logic. Electrically its the same circuit its just how you interpret the voltage level as Hi or Lo

Answer 7

Gary H. is correct.

There is no single 'gate' that is an AND-OR. What AND-OR refers to is any logic combination that can be expressed as the sum of products. The only exception to this would be a look-up-table (LUT) logic device inside an FPGA, that can implement a sum-of-products in a single entity.

Programmable logic devices (PLD, PAL, CPLD) use this AND-OR type of logic to implement most other logic functions because any combinational logic function can be expressed as a sum-of-products.

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Answer 8

I know of and-or gates only in computer programming. They are places where the program goes in one direction if you choose 'and' and a totally different direction if you choose 'or' ... and I believe the 'or' programming goes farther than the 'and' programming, but the 'gate' is that point where you MUST make a decision between 'and' or 'or' in your logic.

Answer 9

and gates has a number of inputs and one out put.
if all inputs are true then the oputput is true as well, otherwise the output is false.

or gates if only one of the inputs is true, the output is true as well, if all inputs are false, so is the output.

the gates are electronic devices

Answer 10

And-Or gates are a part of Circuit designing, they are usualy ment to determin weather a signal shoud be distributed in two or should it chose one path based on a perticular criteria.