# Relationship between logic gates and transistors

### transistors - How are logic gates created electronically? - Electrical Engineering Stack Exchange

When you string a bunch of these transistors together, then you get what's called a logic gate, which lets you add, subtract, multiply, and divide binary numbers in. Electronics Tutorial about the Digital Logic Gate and the kinds of Digital between 10 and transistors or tens of gates within a single package and Then we can summarise the relationship between these various digital states as being. N-type MOS Transistor. MOS = Metal Oxide Semiconductor. • two types: N-type and P-type. N-type. • when Gate has positive voltage, short circuit between #1.

As you can see, the only way to get a 1 for an output is to have two of the same inputs flowing in.

Logic Gates from Transistors: Transistors and Boolean Logic

Otherwise, the gate in a transistor remains closed, and no electricity will be able to flow through. An AND logic gate with two inputs and one output. In this example, our chicken and rooster are not dependent on each other, so if a chicken OR a rooster approaches our gate, we will open it for them.

### How Logic Gates Work in Digital Electronics | EAGLE | Blog

With an OR gate, you only need one of your inputs to be a 1 for the output to also be a 1. If we have a chicken OR a rooster at our gate, then we will open the gate. If we have a chicken OR no rooster at our gate, then we will open the gate.

If we have no chicken OR no rooster at our gate, then we will keep the gate closed. The pattern here is also pretty clear as well. Both of our inputs are not dependent on each other, and so long as one of them is present, our gate will open. If you want to quickly identify an OR gate on a schematic, look for this symbol: An OR logic gate which only requires one input to be 1.

Despite our goat representing a 1 in our logic gate as an input, a NOT gate always produces an opposite output. NOT gates are a bit strange when compared to other gates, as they always do the complete opposite of whatever input value you provide it. These gates also only require one input to produce their output, whereas other gates will always need two inputs.

A NOT logic gate provides the opposite of its input value as its output. If we have no chicken or rooster at our gate, then we will keep the gate closed. If we have both a chicken and a rooster at our gate, then we will keep the gate closed.

## . What is the relationship between transistors and gates?

And to put a XOR gate on a schematic, be on the lookout for this symbol: And if the inputs are different, they output will be 0, or false. For our chickens, we can use an XNOR gate to open our gate only when a chicken and rooster pair journey out together, or if there are no chicken or roosters together. If we have a chicken but not a rooster at our gate, then we will keep the gate closed.

If we have no chicken OR rooster at our gate, then we will open the gate.

## From Transistors to Functions

An XNOR logic gate only returns a 1 output value if the two inputs are the same. A NAND gate is just what we need to make this happen: If we have a chicken AND no rooster at our gate, then we will open the gate. If we have no chicken AND no rooster at our gate, then we will open the gate. A NAND logic gate returns an output of 0 when both inputs are 1. The NOR gate is just what we need: If we have a chicken OR a rooster at our gate, then we will not open the gate.

If we have a chicken OR no rooster at our gate, then we will not open the gate.

If all of our chickens are safe in their coop and not at our gate, then we will open the gate. It first compared the two values using OR logic and then provides an opposite output based on the OR logic.

By using a combination of logic gates together in an integrated circuit, you can perform some incredibly complex calculations. First off the Invertor: A "high" on the input gives a "low" on the output, a "low" on the input gives a "high" on the output. This is deliberate as a MOS transistor IS a capacitor and it is mainly this capacitance that is charged and discharged during operation.

Current is the flow of charge per time and capacitance is the storage of charge per voltage. Transistors turn gate voltage into controlled currents that then charge and discharge gate capacitances that turns that change in charge back into a change in voltage.

Now for the first two input gate the NAND gate: So in that condition Vout will sink current and the Vout will be Low.

To turn into a AND gate you just need to invert the output. And it's truth table: This is often done for area efficiency, power efficiency or even for speed. C A B Out 0 0 0 0 0 0 1 0 0 1 0 0 0 1 1 0 1 0 0 0 1 0 1 1 1 1 0 1 1 1 1 1 Least you think that this is the only way to implement these functions, I'll introduce a device that is called the transmission gate.

Here is a sample circuit of what you can do with an additional NMOS.