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CMOS VLSI Design Question Paper - May 18 - Electronics Engineering (Semester 8) - Mumbai University (MU)
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CMOS VLSI Design - May 18

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.Solve any four of the following.

1.a. Explain behavior of gm as function of below parameters.i)Overdrive voltage with W/L constant. ii) Overdrive voltage with ID constant.
(5 marks) 9204

1.b What are different second order effects in NMOS?
(5 marks) 9207

1.c Explain the concept of switched capacitor circuit.
(5 marks) 6966

1.d Compare performance of various op-amp topologies.
(5 marks) 6934

1.e Explain active current mirror circuit.
(5 marks) 9203

2.a For W/L=50/0.5 and ID=0.5mA, calculate the transconductance and output impedance of both NMOS and PMOS device. Also find the intrinsic gain.
(10 marks) 9208

2.b What is a band gap reference? Describe methods of implementation of band gap references.
(10 marks) 6898

3.a For common source stage with diode connected load, if the variation of $\eta$=gmb/gm with the output voltage is neglected, Prove that the gain is independent of bias current and voltages.
(10 marks) 9215

3.b Derive equation of differential gain ,common mode gain and CMRR of differential amplifier.
(10 marks) 9220

4.a Explain the concept of clock feed through in charge pump. Charge injection, charge sharing in charge pump.
(10 marks) 6973

4.b Derive expression for voltage gain AV and output resistance Ro of source follower stage.
(10 marks) 9210

5 Design two stage operational amplifiers that meet the following specifications with a phase margin of 60. Assume the channel length is to be 1$\mu$m, K$_N$=100$\mu A/V^2$, K$_P$=20$\mu A/V^2$, V$_{TN}$=$\mid$V$_{TP} \mid$=0.5V, $\lambda _N$=0.06V$^{-1}$, and $\lambda _P$=0.08V$^{-1}$ A$_V$>500v/v, V$_{dd}$=2.5V, V$_{ss}$= -2.5v, GB=5MHz, CL=10pf, SR>10v/$\mu$sec, Vout range= +/- 2V, ICMR=-1 to 2V, Pdiss<=2mw.
(20 marks) 9224

6 Write short note on any four

6.a Types of Noise of CS stage
(5 marks) 9213

6.b Cascode current mirror circuit.
(5 marks) 9202

6.c Advantage and disadvantages of DLL
(5 marks) 9254

6.d Comparison of full custom design and semi custom design
(5 marks) 9257

6.e Performance parameters of VCO
(5 marks) 9252

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