Table of Contents
How does a NAND gate work physically?
A NAND gate has its output low only when both inputs are high. You can see how this works in the circuit above; with both inputs high, both transistors are fully on, and the output is close to ground (actually it is at 2 x the collector-emitter voltage Vce of the transistors).
How logic gates are physically constructed?
When a transistor is on, or open, then an electric current can flow through. 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 any way imaginable. In a physical circuit, these logic gates have: Inputs.
How an AND gate can be constructed with the help of NAND gates?
AND: You can create an AND gate by using two NAND gates. The first NAND gate does what NAND gates do: returns LOW if both inputs are HIGH and returns HIGH if both inputs are anything else. Then the second NAND gate is configured as a NOT gate to invert the output from the first NAND gate.
Do logic gates exist physically?
A logic gate is an idealized model of computation or physical electronic device implementing a Boolean function, a logical operation performed on one or more binary inputs that produces a single binary output. In modern practice, most gates are made from MOSFETs (metal–oxide–semiconductor field-effect transistors).
What are the advantages of NAND gate?
Advantages and Disadvantages of NAND -Cost: NAND is cost-effective per byte and has a high storage capacity for its physical size. -Endurance: NAND cells eventually wear out as their transistors degrade.
How does OR gate work?
An OR gate is a logic gate that performs logical OR operation. A logical OR operation has a high output (1) if one or both the inputs to the gate are high (1). If neither input is high, a low output (0) results. Just like an AND gate, an OR gate may have any number of input probes but only one output probe.
HOW AND gate is formed?
AND gate is formed by using two NAND gates.
Why NAND gate is called universal gate?
An OR gate can be replaced by NAND gates as shown in the figure (The OR gate is replaced by a NAND gate with all its inputs complemented by NAND gate inverters). Thus, the NAND gate is a universal gate since it can implement the AND, OR and NOT functions.
How do you make a NAND gate NOT gate?
A NOT gate is made by joining the inputs of a NAND gate together. Since a NAND gate is equivalent to an AND gate followed by a NOT gate, joining the inputs of a NAND gate leaves only the NOT gate.
Why NAND and NOR gates are called universal gates?
Answer: The NAND & NOR gates are called universal gates because they perform all the logical operations of basis gates like AND, OR, NOT. Answer: NOR AS AND An AND gate gives a 1 output when both inputs are 1; a NOR gate gives a 1 output only when both inputs are 0.