JNTU question papers – B -Tech II Semester Examinations, VLSI Design, Apr/May 2008

JNTU B.Tech II Semester Examinations, VLSI DESIGN, Apr/May 2008

 ( Common to Electronics & Communication Engineering, Bio-Medical

Engineering and Electronics & Telematics)

Time: 3 hours Max Marks: 80

Answer any FIVE Questions

All Questions carry equal marks


1. With neat sketches, explain in detail, all the steps involved in electron lithography

process. [16]


2. (a) Explain nMOS inverter and latch up in CMOS circuits?

(b) Draw the nMOS transistor circuit model and explain various components of the model. [8+8]


3. Draw the stick diagram and mask layout for a CMOS two input NOR gate and stick diagram of two input NAND gate. [16]


4. (a) Explain the concept of sheet resistance and apply it to compute the ON resistance (VDD to GND) of an NMOS inverter having pull up to pull down ratio of 4:1, If n channel resistance is Rsn = 104  per square.

(b) Calculate the gate capacitance value of 5?m technology minimum size transistor with gate to channel capacitance value is 4 × 10?4pF/?m2. [10+6]


5. (a) Explain the CMOS system design based on the data path operators with a

suitable example.

(b) Draw and explain the basic Memory- chip architecture. [8+8]


6. (a) What are the characteristics of 22V10 PAL CMOS device and draw its I/O structure.

(b) Explain any one chip architecture that used the antifuse and give its advantages. [8+8]


7. (a) What are the different types of operators used in VHDL? Give some examples

using this.

(b) Compare the Circuit-level, Logic-level, switch-level and Timing simulations. [8+8]


8. (a) compare functionality test and manufacturing test.

(b) What type of testing techniques are suitable for the following:

i. Memories

ii. Random logic

iii. Data path.

(c) How IDDQ testing is used to test the bridge faults? [5+6+5]

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