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Pune University - Sem - I : Analog Circuit Design & Analysis, April 2010

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Total No. of Questions : 5] P1155 [Total No. of Pages : 3 [3729]- 102 M.Sc. ELECTRONIC SCIENCE EL1 UT 02 : Analog Circuit Design and Analysis (New Course) (2008 Pattern) (Sem. - I) Time : 3 Hours] Instructions to the candidates: 1) All questions are compulsory. 2) Figures to the right indicate full marks. 3) Draw neat diagrams wherever necessary. 4) Use of log table, non-programmable calculator is allowed. [Max. Marks : 80 Q1) Solve any two : a) i) ii) b) i) ii) c) i) ii) Define Laplace transform. Explain following theorems regarding Laplace transform. Transform of first derivative. Laplace transform of linear combinations. [4] What are the advantages of Laplace transformation over classical method? What are its applications. [4] What is a two port network? Explain what are its transmission and admittance parameters? [4] What is an attenuator? What is its use? Draw the circuit of symmetrical - attenuator and give its design equations. [4] Design an inverting amplifier with a gain of 15. It must have an input impedance of 10 k . How would you estimate its offset error? [4] A voltage V(t) = 6 e 2t is applied at time t = 0 to a series RL circuit with R = 3 ohm and L = 1 henry. Obtain complete solution for current i(t) in the circuit using Laplace transformation. Assume zero current through L before application of voltage. [4] Q2) Solve any two : a) i) ii) Define the terms open loop gain, loop gain and closed loop gain of an operational amplifier. What is gain error factor. [4] Explain applications of constant current source in discrete circuits as well as in internal circuit of op-amp. [4] P.T.O. b) i) ii) c) Explain the working of Widlar current source. What is its advantage? [4] Explain giving necessary equations working of source coupled JFET pair. [4] i) Design a 3-op-amp instrumentation amplifier for an overall gain of 60. [4] ii) An op-amp has a slew rate of 1V/ sec. What is the maximum frequency for which the amplifier will give an undistorted sinewave output of 12 Vp p 15 Vp p [4] Q3) Solve any two : a) i) ii) b) i) ii) c) i) ii) Compare the performance of inverting and non-inverting amplifiers regarding the following. [4] Feedback connection gain common mode errors input impedance. Give the steps involved in the design of a differentiator circuit. Why is differentiator inherently unstable? [4] Explain the term unity gain frequency compensation . Why is such an amplifier stable for any value of resistive feedback? [4] Explain the significance of dc and low frequency parameters of an op-amp. [4] Explain the working of a two op-amp practical log amplifier circuit. Obtain the necessary equation. [4] The input to an inverting amplifier with a gain of 10 is Vi = 0.5 sin 2000 t volt. Find the output Vo and the frequency and period of Vi and Vo. [4] Q4) Solve any two : a) i) ii) b) i) ii) [3729]-102 Explain shielding and guarding techniques used in low current/ voltage amplifiers. [4] What are the applications in which a high power op-amp is needed. Explain working and relevant parameters of a typical power op-amp. [4] Explain woking of the circuits to boost the output current capability of an op-amp. [6] State the output voltage and current ratings of a typical general purpose op-amp. [2] 2 c) What is an active filter? What are its advantages and limitations as compared to passive filters? Give the circuit diagram, transfer function and design equations for a VCVS second order Butterworth low pass filter. [8] Q5) Solve any two : a) Giving a neat block diagram explain the working of a first order sigma-delta analog to digital converter. In this regards explain the terms oversampling, digital filter and decimation. [8] b) i) ii) c) i) ii) Explain typical performance specifications of analogue to digital converters. [4] Explain applications of digital to analogue converters. [4] Give the working of potentiometric DAC. What are its advantages? [4] Explain the working of successive approximation type ADC. [4] xxxx [3729]-102 3

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Additional Info : M.Sc. Electronic Science, EL1 UT 02 : Analog Circuit Design and Analysis ( New Course) (2008 Pattern) (Semister - I), Pune University
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