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Very Large Scale Integration (VLSI)

Very Large Scale Integration (VLSI) is a technology used to fabricate integrated circuits (IC). The various stages of design, simulation, synthesis, timing analysis, layout and fabrication can be discussed in this category. It is a wide spread technology as most of the existing technologies are digital technologies and need an IC to implement. It is VLSI which made computer to be of the size of a pocket from the size of two rooms.

500 Questions

What are the limitation of using a photo lithography?

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Asked by Wiki User

Some limitations of photolithography include limited resolution, leading to challenges in fabricating very small features, as well as difficulties in achieving uniform exposure across large substrates. It can also be time-consuming and expensive due to the need for multiple processing steps and precision equipment. Additionally, photolithography may have limitations in creating complex three-dimensional structures.

How do you model inertial and transport delay using Verilog code?

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Asked by Wiki User

In Verilog, you can model inertial delay using # delay model and transport delay using tran delay model. # delay model specifies inertial delay by adding a delay value after signal assignment, while tran delay model specifies transport delay using the tran keyword before signal assignment. Both delay models can be used to accurately model timing behavior in digital circuits.

Which the maximum clock rate is quoted for a logic family it applies to?

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Asked by Wiki User

The maximum clock rate typically quoted for a logic family is the highest frequency at which the components in that family can reliably operate. This frequency is important for determining the speed at which digital circuits can function without encountering errors or timing violations. Different logic families have different maximum clock rates based on their design and technology characteristics.

Why photo lithography is also called as ultra violet lithography?

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Asked by Wiki User

Photo lithography is often referred to as ultraviolet lithography because it uses ultraviolet light to transfer a pattern onto a photosensitive material. The ultraviolet light is able to achieve higher resolution and precision compared to visible light, making it a preferred choice for semiconductor manufacturing processes requiring high levels of detail.

Why are pmos larger than nmos in cmos design?

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Asked by Wiki User

PMOS transistors are typically larger than NMOS transistors in CMOS design because the mobility of holes (the charge carriers in PMOS) is lower than that of electrons (the charge carriers in NMOS). This means that a larger current-carrying area is needed in the PMOS to achieve the same performance as the NMOS transistor. By making the PMOS larger, designers can balance the drive strengths of the two types of transistors in a CMOS circuit.

What result can be printed by using the lithography?

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Asked by Wiki User

Lithography can be used to print a variety of results, such as images, patterns, and text, onto different materials like paper, metal, or semiconductor wafers. Its high precision and resolution make it ideal for producing detailed and intricate designs in industries like printing, semiconductor manufacturing, and microelectronics.

What happens to the bulb and there resistant variable resistor increase?

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Asked by Wiki User

If the resistance of the variable resistor increases, the current flowing through the circuit decreases. As a result, the bulb will emit less light or may not light up at all, depending on the magnitude of the resistance increase.

What is the full form of light?

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Asked by Wiki User

Light Amplification by Stimulated Emission of Radiation.

What is the difference between evaporation and sputtering deposition?

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Asked by Ramarav

Evaporation is the process of converting a substance from its liquid or solid state to a vapor, typically by heating. Sputtering deposition, on the other hand, is a physical vapor deposition technique where atoms or molecules are ejected from a target material by bombarding it with high-energy particles. Evaporation is a thermal process, while sputtering is a physical process involving momentum transfer.

How diffusion coefficient depends on temperature?

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Asked by Ramarav

The diffusion coefficient generally increases with temperature. This is because higher temperatures lead to greater thermal energy, which enhances the movement of particles, resulting in increased diffusion rates. The relationship between diffusion coefficient and temperature can often be described by Arrhenius equation or by simple proportional relationship in many cases.

Why the ttl change in the same ping?

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Asked by Wiki User

The TTL (Time to Live) value in a ping packet decreases by 1 each time it passes through a router. This helps prevent packets from circulating endlessly in a network. When a TTL reaches 0, the router discards the packet and sends an ICMP Time Exceeded message.

What is a dimer in ion implantation?

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Asked by Wiki User

In ion implantation, a dimer refers to two atoms that are implanted simultaneously into a target material. This can be beneficial for certain applications where the presence of two atoms together can create specific interactions or properties in the material. Dimer implantation can be used to tailor the material's properties by controlling the concentration and distribution of the two types of atoms.

Why does AgBr show both Frenkel and Schottky defects?

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Asked by Shubham2546

The radius ratio for AgBr is intermediate. Thus it shows both frenkel and schottky defects.

The major defect in AgBr is the Frenkel defect. It has a rocksalt structure i.e. CCP lattice of of Br with atoms of Ag occupying all octahedral holes.Ag moves from octahedral to tetrahedral sites causing only cations to precipitate.

Schottky defect arise due to missing of ions from their lacttice point and frenkel arise when the mmissing ions occupy interstitial sites.

in AgBr, ag+ ion is small in size and when removed from lacttice point they can occupy interstitial site and therefore show both frenkel and schottky defect. SCHOTTKY Defect in AgBr is exhibited due to precipitation of both Cations and Anions.

Is there change in volume of a crystal having schottky defect?

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Asked by Wiki User

Yes, a crystal with Schottky defects can have a change in volume due to the vacancies created by the missing atoms. This can lead to a decrease in the total volume of the crystal, impacting its overall density and properties.

Why using flipflop for physical design in vlsi?

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Asked by Wiki User

Flip-flops are commonly used in VLSI physical design for sequential logic circuits due to their ability to store binary information and synchronize signals. They help in controlling the timing of signals and reduce the chances of metastability issues. Flip-flops also provide a way to control the state of a circuit at specific clock edges, aiding in sequential circuit design.

How does ttl shutdown work?

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Asked by Wiki User

TTL (Time To Live) shutdown is a feature that automatically terminates a connection if the TTL value (which represents the maximum number of hops a packet can traverse) expires. This helps prevent indefinite looping or other issues that can occur if a packet does not reach its destination. Once the TTL value reaches 0, the connection is forcibly closed to ensure network stability and security.

What statement best describes the lithography technique?

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Asked by Wiki User

Lithography is a printing technique where images are transferred onto a material by selective application of ink or pigment to a surface, typically a metal plate, and then transferred to paper or other material. It is commonly used in printing newspapers, books, and packaging due to its ability to produce high-quality, detailed prints at a large scale.

What do the parameters reported back by ping of time and TTL represent?

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Asked by Wiki User

The time parameter in a ping response represents the round-trip time taken for the packet to reach the destination and come back. The TTL (Time to Live) parameter is the maximum number of network hops (routers) that a packet can traverse before being discarded.

Why ion implantation is necessary?

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Asked by Wiki User

Ion implantation is necessary in semiconductor manufacturing to precisely introduce dopant atoms into the crystal lattice of a semiconductor material, which helps modify its electrical properties. This process allows for precise control of the dopant concentration and profile, enabling the creation of specific device characteristics such as the conductivity type and doping level. Ion implantation is also used for creating shallow junctions in transistors and optimizing device performance.

Advantages of ion implantation over diffusion?

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Asked by Wiki User

Ion implantation allows for precise control of dopant concentration and depth, resulting in more uniform doping profiles compared to diffusion processes. It also enables the doping of materials that are difficult to dope by diffusion. Additionally, ion implantation can be performed at lower temperatures, reducing the likelihood of damaging the material being processed.

What are the uses of a NOT logic gate?

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Asked by Wiki User

A NOT gate is used to invert the input signal, meaning it produces the opposite output to the input. It is commonly used in digital circuits for tasks such as signal inversion, logic gating, and arithmetic operations.

What are the differences between the Frenkel and Schottky defects?

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Asked by Wiki User

Frenkel defects involve the migration of an atom from its original lattice site to an interstitial site, whereas Schottky defects are related to the simultaneous creation of vacancies in the crystal lattice. Frenkel defects are common in compound semiconductors, while Schottky defects are more prevalent in ionic solids like metal halides.

Do compound semiconductors behave as intrinsic semiconductors?

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Asked by Wiki User

No, compound semiconductors do not behave as intrinsic semiconductors because they have different band structures due to the combination of different elements. Compound semiconductors have unique electrical properties that make them suitable for specific applications that require different performance characteristics compared to intrinsic semiconductors.

What is the difference in the switching speed of TTL and CMOS?

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Asked by Wiki User

CMOS technology generally has faster switching speeds compared to TTL technology. This is because CMOS uses complementary pairs of MOSFETs, which have higher input impedance and lower power consumption, allowing for faster operation. TTL technology, on the other hand, uses bipolar transistors which have higher power consumption and longer switching times.

Can a TTL chip drive a CMOS chip?

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Asked by Wiki User

Yes, a TTL chip can drive a CMOS chip but it may require level shifting to ensure compatibility due to differences in voltage thresholds between the two technologies. TTL operates at 5V logic levels while CMOS operates at lower voltage levels like 3.3V or 1.8V. Level shifters can be used to bridge this gap and allow the TTL chip to communicate with the CMOS chip effectively.