December 17, 2011

VLSI DESIGN JNTU previous years question papers

VLSI DESIGN JNTU previous years question papers

Time: 3 hours Max Marks: 80
Answer any FIVE Questions
All Questions carry equal marks

1. Distinguish between thin film resistors and thin film capacitors in all aspects. [16]

2. (a) Derive an equation for Ids of an n channel enhancement MOSFET operating
in saturation region.
(b) An n MOS transistor is operating in saturation region with the following
parameters.Vgs=5V, Vtn =1.2V, (W/L) =10: µncox=110µA/V 2. Find transcon-
ductance of the device. [8+8]

3. (a) Discuss the rule for n well and VDD and Vss contacts (2µm CMOS).
(b) Discuss the rule for pad and over glass geometry (2µm CMOS). [8+8]

4. Calculate on resistance of the circuit from VDD to GND. If
n- channel sheet resistance Rsn=104
per square and P-channel sheet resistance
Rsp = 3.5 × 104
per square

5. Draw the logic diagram for a ripple-carry binary counter using T registers and ex-
plain its operation with the help of truth table and also compare it with synchronous
counters. Draw the schematic for T register. [16]

6. (a) Draw the typical architecture of PAL and explain the operation of it.
(b) What is CPLD? Draw its basic structure and give its applications.

7. (a) Explain how a FSM model is described in VHDL with suitable program.
(b) What is the difference between Design capture tools and design verification
tools? Give some examples of each. [8+8]

8. (a) Explain the gate level and function level of testing.
(b) A sequential circuit with in? inputs and ‘m’ storage devices. To test this
circuit how many test vectors are required.
(c) What is sequential fault grading? Explain how it is analyzed.



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