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CMOS VLSI Design Question Paper - May 17 - Electronics Engineering (Semester 8) - Mumbai University (MU)
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CMOS VLSI Design - May 17

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 Analyze following circuit to get voltage gain equation if M2 is twice wide as that of M1 and Vin1=Vin2

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(5 marks) 6927

1.b Explain importance of Miller Theorem
(5 marks) 9216

1.c List the non-ideal effects in Charged Pump circuit and justify how it impacts the PLL performance.
(5 marks) 9249

1.d With the help of suitable circuit diagram, Justify True or false: Cascode current mirror current matching performance is better the Basic current mirror.
(5 marks) 9200

2.a Derive expression for Voltage gain Av and output resistance Ro of Source follower stage.
(10 marks) 9210

2.b Explain in detail how to generate temperature independent references.
(10 marks) 9201

3.a Explain the concept of clock feed through in Charged Pump, Charge injection Charge Sharing in Charged Pump
(10 marks) 6973

3.b Explain the concept of switched capacitor circuit.Draw and explain discrete time integrator along with the output waveform
(10 marks) 6966

4.a Explain common mode response of differential pair with necessary derivations
(10 marks) 9219

4.b Explain White & Flicker noise in MOSFET. Derive equation for output and input referred noise voltage of CS stage.
(10 marks) 9211

5 Design two stage Operational Transconductance Amplifier(OTA) to meet following specifications-with a phase margin of 60, A$_V$>4000v/v ,V$_{dd}$=2.5V, V$_{ss}$= -2.5v, GBW=6MHz, CL=10pf, SR>10v/$\mu$sec, Vout range= +/- 2V, ICMR=-1.125V to 2V, Pdiss<=2.5mw Use, K$_N$=110$\mu A/V^2$, K$_P$=50$\mu A/V^2$, V$_{TN}$=$\mid$V$_{TP} \mid$=0.7V, $\lambda _N$=0.04V$^{-1}$, and $\lambda _P$=0.05V$^{-1}$ , Cox=2.47fF/$\mu m^2$, Verify that the designed circuit meets required Voltage Gain and Power Dissipation specifications.
(20 marks) 9224

6.a Give comparison between Full-custom and Semi-custom design.
(5 marks) 9257

6.b Compare various opamp topologies
(5 marks) 6934

6.c Compare the performance of Ring and LC oscillators in terms of phase noise, area, Q factor and application.
(5 marks) 9250

6.d Derive the expression of input referred noise voltage of common source stage
(5 marks) 9212

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