# JNTU Kakinada B-Tech 4-1 DIGITAL IC DESIGN R13 March 2018 Question Paper

IV B.Tech I Semester Supplementary Examinations, February/March – 2018
DIGITAL IC DESIGN (Electronics and Communications Engineering)Time: 3 hours Max. Marks: 70
Question paper consists of Part-A and Part-B
Answer ALL sub questions from Part-A
Answer any THREE questions from Part-B
*****

PART ?A (22 Marks)1. a) Define Inverter threshold voltage. [4]
b) Explain General circuit structure of an nMOS inverter. [4]
c) Calculate the W/L ratio of the series connected transistors. [4]
e) What is a crosstalk? Explain. [3]
f) State the advantages of Polysilicon Interconnect. [3]

PART ?B (3×16 = 48 Marks)
2. a) Explain necessary theorems of transistor equivalency [8]
b) Derive the expression for gain, input resistance, output resistance of pseudo
NMOS inverter.
[8]

3. a) Draw and explain the operation of CMOS Transmission gate. [8]
b) Derive the expression for V
OH
and V
OL
for two input NOR gate [8]

4. a) Draw CMOS AOI realization of the JK latch and explain its operation. [8]
b) Discuss how a D Latch can be realized using CMOS. [8]

5. a) Explain Domino CMOS Logic gate operation. [8]
b) Discuss the charge-sharing problems in VLSI circuits. Explain various circuit
techniques used in domino CMOS circuits for solving charge-sharing problems
[8]

6. a) Explain about capacitive interconnect. [8]
b) Estimate the capacitance to ground per unit length for a polysilicon
interconnect, 0.25 micro meter wide and 0.25 micrometer thick, on a 0.5 micro
meter thick layer of silicon dioxide (relative permitivity = 3.9).

[8]

7. a) Draw circuit diagrams of the row decoder and the column decoder for an
EPROM with 4 rows and 2 columns. Use nMOS technology. Develop formulas
for the row and column delays in the EPROM. Define any terms in your
formulas which are not obvious.

[12]
b) Define memory and give a classification. [4]

Code No: QT41048
Set No. 1
R13
1 of 1

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