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Previous Year Exam Questions of Analog Electronic Circuits of bput - AEC by Verified Writer

  • Analog Electronic Circuits - AEC
  • 2017
  • PYQ
  • Biju Patnaik University of Technology Rourkela Odisha - BPUT
  • Electronics and Instrumentation Engineering
  • B.Tech
  • 235 Offline Downloads
  • Uploaded 2 years ago
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Q3 a) b) Q4 a) b) Q5 a) b) Explain the characteristics of a JFET. With diagram, explain the self- biasing schemes used in JFET. Derive necessary equations relating voltage and current at different terminals in this bias. Sketch hybrid- model of CB amplifier. Derive relations of gain, input and output impedances. (10) Derive the expression for IC and VCE for a CE amplifier with bypass RE and with unbypassed RE and compare the results. List advantages and disadvantages of negative feedback on amplifier performance. How it affects various parameters of an amplifier? (10) Differentiate between differential and common mode operation of an OPAMP? Define CMRR and its significance. Explain a differentiator circuit using OP-AMP. State and explain the Barkhausen criterion for sustained oscillations. Discuss its importance in operation of an oscillator circuit. (10) (5) (5) (5) Q6 a) b) Derive the expression for high cut-off frequencies of a FET amplifier network. For a self-bias configuration of FET circuit with VDD=20V, RD=3.3KΩ, RS=1KΩ, RG=1MΩ, IDSS=8mA, VP= -6V, calculate , , VDS, VG, VD. (10) (5) Q7 a) Define h-parameters for a CE amplifier. With neat sketches explain how these can be obtained graphically from input and output characteristic of the transistor? What is Miller effect capacitance in a transistor-amplifier? How does it affect the cutoff frequency of the amplifier circuit? (10) Differentiate between power amplifier and voltage amplifier. Explain operation of a push-pull amplifier for class AB operation. What are the advantages of class B over class A amplifier? Which feedback technique is there in an emitter follower circuit? Draw the topology and derive the expression of input impedance for that feedback network. (10) With neat circuit diagram, explain the working of two-stage RC coupled amplifier and derive the output relation of each stage. Sketch the frequency response curve and discuss methods to improve gain bandwidth product. Show that OP-AMP can be used as voltage buffer and controlled sources. (10) b) Q8 a) b) Q9 a) b) (5) (5) (5)

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