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M.E. DEGREE EXAMINATION, JUNE 2012.
Second semester
Applied Electronics
AP 9221/248204/AP 921/10244 AE 201— ANALYSIS AND DESIGN OF ANALOG INTEGRATED CIRCUITS
(Common to M.E. VLSI Design)
(Regulation 2009)
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ANNA UNIVERSITY SYLLABUS - Click Here
PART A— (10 × 2 = 20 marks)
1. Compare long channel and short channel MOS transistors.
2. State the effect of substrate voltage on MOS device characteristics.
3. Define sensitivity factor Svdd vref
4. Draw the circuit schematic of a source follower with current mirror load.
5. Define slew rate and state its significance.
6. What are the various types of noises that affect the performance of operational amplifier?
7. Name the applications and the conditions for each application of Gilbert cell multiplier.
8. Give any two application of PLL.
9. What are the advantages of folded cascade configuration?
10. State the effect of channel length modulation on the current mirror ratio.
PART B— (5 × 16 = 80 marks)
11. (a) (i) Derive the small signal low frequency model for a MOS transistor operating in the ohmic region with Q point IDQ,VasQ, VDSQ and VBSQ. (10)
(ii) What does this reduce to when VDSQ = OV? (6)
Or
(b) (i) Explain the various second order effects of MOS transistors. (8)
(ii) From basic principles obtain the Id – V ps relationship in MOS transistors.(8)
12. (a) (i) Discuss the operation of Band gap voltage reference circuit. Show that it is temperature insensitive voltage reference. (10)
(ii) Explain operational amplifier noise model. (6)
Or
(b) Draw the schematic of FET differential amplifier with active load and explain the effect of mismatch of gm and Rd on the gain of differential amplifier.
13. (a) Analyse the operational amplifier circuit in terms of slew rate model and high frequency response.
Or
(b) Explain the frequency response characteristics of any one multistage amplifier with relevant expression.
14. (a) Discuss the noise models of the various integrated circuit components.
Or
(b) Draw a four Quadrant Multiplier circuit using Gilbert cell and discuss.
15. (a) (i) With schematic and expressions compare cascade, Wilson and widlar current sources. (8)
(ii) Draw the circuit of MOS folded cascode operational amplifier and explain. (8)
Or
(b) (i) Discuss the schematic and characteristics of telescopic operational amplifier. (8)
(ii) Explain any one type of o/p stage of op amp. (8)
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