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Pune University - SY BSc (Sem - I) ELECTRONIC SCIENCE - I, April 2010

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Total No. of Questions : 4] P280 [Total No. of Pages : 2 [3717] - 123 S.Y. B.Sc. ELECTRONIC SCIENCE EL - 211 : Analog Circuits and Systems - I (New) (Semester - I) (Paper - I) (22211) Time : 2 Hours] Instructions to the candidates : 1) All questions are compulsory. 2) Neat diagrams must be drawn wherever necessary. 3) Figures to the right indicates full marks. 4) Use of non-programmable calculator is allowed. [Max. Marks : 40 Q1) Attempt all of the following: a) Express power gain in decibels. [1] b) Define the slew rate of an OP - AMP. [1] c) What is harmonic distortion? [1] d) Define the term CMRR. [1] e) Mostly transformer coupling is preferred in large signal amplifiers comment. [2] f) The effect of distortion can be minimized with the use of negative feedback - comment. [2] g) The OP - AMP is used in inverting mode and non - inverting mode with R1 = 1 K and Rf = 100 K , Vin = 10 mV and VCC = 12V. Find V0 in each case. [2] h) A power transistor dissipates 4W. If the junction temperature Tjmax i s 100 C and the thermal resistance = 5 c/W. Calculate the maximum ambient temperature at which it can be operated. [2] Q2) Attempt any TWO of the following: [2 x 4 = 8] a) State the design steps involved in a single stage class - A amplifier circuit. b) Draw a circuit diagram of differential amplifier with constant current source. Explain its need and significance. Explain with block diagram voltage series feedback and shunt feedback. c) P.T.O.

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Additional Info : S.Y. B.Sc. Electronic Science (Semister - I), EL - 211 : Analog Circuits and Systems - I (Paper - I) (New Course), Pune University
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