Saturday , October 23 2021

VLSI

What is latch up problem and how can it be eliminated

What is latch up problem and how can it be eliminated

What is latch up problem and how can it be eliminated   The latch is the generation of a low-impedance path in CMOS chips between the power supply and the ground rails due to the interaction of parasitic pnp and npn bipolar transistors. These BJTs for a silicon-controlled rectifier with …

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Limitation of cascaded dynamic logic and solution

Limitation of cascaded dynamic logic and solution

Limitation of cascaded dynamic logic and solution   In dynamic logic, a retardant arises when cascading one gate to subsequent. The precharge “1” state of the primary gate may cause the second gate(N2) to discharge prematurely before the primary gate(N1) has reached its correct state. But N1 uses up the …

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Domino logic and Zipper logic

Domino logic and Zipper logic

Domino logic and Zipper logic   Domino logic: In dynamic logic, a retardant arises when cascading one gate to subsequent. The precharge “1” state of the primary gate may cause the second gate to discharge prematurely before the primary gate has reached its correct state. This uses up the “precharge” of the second gate, which can’t be restored until …

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Explain body effects in MOS transistor?

Explain body effects in MOS transistor

Explain body effects in MOS transistor?   body effects in MOS transistor Normally, we considered a transistor to be a three-terminal device with gate, source, and drain. However, the body is an implicit fourth terminal. Body effects refer to the change in the transistor threshold voltage (vt) resulting from a …

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What is hot carrier effect

What is hot carrier effect

Question: What is hot carrier effect? How can be minimized hot carrier effect?   Hot carrier effect: As the feature size decreases, the electric field in the channel region increases which leads to gain high kinetic energy by holes and electrons (Hot carrier). High kinetic energy helps them to inject …

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Characteristics of MOS dynamic circuit

Characteristics of MOS dynamic circuit

Question: What are the Key Characteristics of MOS dynamic circuit ? What makes dynamic CMOS circuit faster than a static CMOS circuit?   Solution: The Key Characteristics of MOS dynamic circuit The advantage of low power of static CMOS circuit and smaller chip area of nMOS circuits are combined in …

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Short channel effects

Short channel effects

Discuss Short channel effects   Short channel effects are a series of phenomena that take place when the channel length of the MOSFET becomes approximately equal to the space charge regions of source and drain junctions with the substrate. They lead to a series of issues including polysilicon gate depletion …

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What is VHDL and advantages of VHDL

What is VHDL and the advantages of VHDL

What is VHDL and the advantages of VHDL   VHDL The VHSIC Hardware Description Language (VHDL) is a hardware description language (HDL)that can model the behavior and structure of digital systems at multiple levels of abstraction, starting from the system level right down to that of logic gates, for design entry, documentation, and verification purposes.   …

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RCA cleaning process

RCA cleaning process

Question: Explain the RCA cleaning process   RCA cleaning process The RCA clean is a Front End of Line (FOEL) cleaning process. the aim of RCA clean is to get rid of organic contaminants from the wafer surface, then remove any oxide layer which will have built-ups, and eventually remove any ionic or heavy metal contaminants. The …

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