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CMOS VLSI Design Question Paper - Dec 16 - Electronics Engineering (Semester 8) - Mumbai University (MU)
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CMOS VLSI Design - Dec 16

Electronics Engineering (Semester 8)

Total marks: 80
Total time: 3 Hours
INSTRUCTIONS
(1) Question 1 is compulsory.
(2) Attempt any three from the remaining questions.
(3) Draw neat diagrams wherever necessary.

1.a. Establish the appropriate relationship between g$_m$ and R$_{on}$ for MOSFET
(5 marks) 6894

1.b Draw and explain LC oscillator.
(5 marks) 6974

1.c Explain the necessity of Millers theorem with suitable example.
(5 marks) 9216

1.d Explain System on chip and System in package.
(5 marks) 9255

2.a What is bandgap reference? In short describe various methods of implementation of bandgap references.
(10 marks) 6898

2.b Draw and explain common gate circuit.
(5 marks) 9209

2.c Sketch lx and the transconductance of the transistor as a function of Vx for each circuit in the given figure as Vx varies from 0 to VDD. For part (a) assume Vx varies from 0 to 1.5V

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(5 marks) 9205

3.a Write qualitative analysis of input-output characteristics of a differential pair. Also mention about common mode characteristics for the same.
(10 marks) 9218

3.b Write in detail about speed considerations of a switch capacitor circuit.
(10 marks) 6968

4.a In the following Figure, sketch V$_x$ and V$_y$ as a function of I$_{REF}$. If I$_{REF}$ requires 0.5V to operate as a current source, what is its maximum value? Assume: for all transistors (W/L)=25/0.5, $\mu _n C _{ox}$=50 $\mu A/V ^2$, V$_{TH}$=0.6V, $\lambda$=$\gamma$=O and V$_{DD}$=3V.

enter image description here

(10 marks) 9206

4.b Explain the following for op-amp I.CMRR II.Input Range Limitation
(5 marks) 6928

4.c Explain the white noise and flicker noise in case of MOSFET. Explain which noise is dominant when?
(5 marks) 9214

5.a Discuss stability issues and frequency compensation of two stage operational amplifier.
(10 marks) 6938

5.b Explain Non-ideal effects in PLL.
(10 marks) 6972

6.a Compare the performance of various op-amp topologies.
(5 marks) 6934

6.b Draw and explain charge pump circuit.
(5 marks) 9248

6.c Explain noninverting switched capacitor amplifier circuit.
(5 marks) 9247

6.d Draw and explain AMS design flow.
(5 marks) 9256

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