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VLSI Interview Questions
Questions Answers Views Company eMail

What happens to delay if we include a resistance at the output of a CMOS circuit?

Infosys,

1 12540

Give the expression for calculating Delay in CMOS circuit?

Infosys,

1 6726

what is charge sharing?

Intel,

1887

Why don?t we use just one NMOS or PMOS transistor as a transmission gate?

Infosys,

2 14847

Explain the working of differential sense amplifier?

 1 5759

What happens if we use an Inverter instead of the Differential Sense Amplifier?

Infosys,

2725

What?s the critical path in a SRAM?

Infosys, Intel, Texas,

2 10221

What happens if we delay the enabling of Clock signal?

 1798

What?s the difference between Testing & Verification?

Infosys,

6 27945

How can you model a SRAM at RTL Level?

Infosys,

5251

what is Latch up?How to avoid Latch up?

 3 23117

What happens if we delay the enabling of Clock signal?

 4 5765

Explain the Charge Sharing problem while sampling data from a Bus?

 4172

Explain why & how a MOSFET works?

Infosys,

2 5906

Explain the various MOSFET Capacitances & their significance?

 1 22432

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Un-Answered Questions { VLSI }

Cross section of a PMOS transistor?

4242

What are the steps involved in designing an optimal pad ring?

712

What types of I/O have you designed? What were their size? Speed? Configuration? Voltage requirements?

2001

What is threshold voltage?

679

what is SCR (Silicon Controlled Rectifier)?

622




Why does the present vlsi circuits use mosfets instead of bjts?

746

Draw a transistor level two input NAND gate. Explain its sizing (a) considering Vth (b) for equal rise and fall times

1063

6-T XOR gate?

3786

What are the different gates where boolean logic are applicable?

588

Explain the working of 4-bit Up/down Counter?

3981

Let A & B be two inputs of the NAND gate. Say signal A arrives at the NAND gate later than signal B. To optimize delay, of the two series NMOS inputs A & B, which one would you place near the output?

862

Implement a function with both ratioes and domino logic and merits and demerits of each logic?

711

Draw the Differential Sense Amplifier and explain its working. Any idea how to size this circuit? (Consider Channel Length Modulation)

895

What was your role in the silicon evaluation/product ramp? What tools did you use?

3207

How does a Bandgap Voltage reference work?

3239

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