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  • AE53/AC53/AT53 ELECTRONIC DEVICES & CIRCUITS DEC 2014 … · Briefly discuss: (i) Superposition theorem (ii) Maximum power transfer theorem ... shown in Fig.1. Ans- c. Find the current
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AE53/AC53/AT53 ELECTRONIC DEVICES & CIRCUITS DEC 2014 © IETE 1 Q.2a. Briefly discuss: (i) Superposition theorem (ii) Maximum power transfer theorem (iii) Duality of networks b. Write loop equations for the circuit shown in Fig.1. Ans- c. Find the current in the Ω 1 resistance using Thevenin’s theorem in fig.2.

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Page 1: AE53/AC53/AT53 ELECTRONIC DEVICES & CIRCUITS DEC 2014 … · Briefly discuss: (i) Superposition theorem (ii) Maximum power transfer theorem ... shown in Fig.1. Ans- c. Find the current

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Q.2a. Briefly discuss: (i) Superposition theorem (ii) Maximum power transfer theorem (iii) Duality of networks b. Write loop equations for the circuit shown in Fig.1.

Ans- c. Find the current in the Ω1 resistance using Thevenin’s theorem in fig.2.

Page 2: AE53/AC53/AT53 ELECTRONIC DEVICES & CIRCUITS DEC 2014 … · Briefly discuss: (i) Superposition theorem (ii) Maximum power transfer theorem ... shown in Fig.1. Ans- c. Find the current

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VTh =12V

Q.3a. Give the symbol, V-I characteristics and one application for any four different types of diodes.

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b.Discuss the capacitances present in junction diodes. How do they affect the high frequency performance?

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c. In a rectifier circuit, mAIKRmAI rmsLdc 14,1,10 =Ω== . Find dc power, ac power in the output and the conversion efficiency.

Q.4a. Draw the circuit of a BJT in CE configuration and the corresponding VI characteristics. Mark the different regions of operation and mention one application for each.

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b.For the following circuit, find BB R,I and CR if V3V,V12V BBCC ==

V5.5V,mA12I CEC == , V7.0V,100 BE ==β and Ω= 50RE .

c.Define the following with respect to an SCR (i) FBOV (ii) Firing angle (iii) Latching current(iv) Holding current

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Q.5 a. What are the hybrid parameters in small signal BJT model? Give the units for

each of them.

b. Compare BJT and FETs.

c. In a CE transistor amplifier circuit,

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(i) for mV50V,A30I,mA2I,0V BEBCCE =µ=== (ii) for mA1.0I,V3.0V,V1V,0I CBECEB ==== . Find h-parameters. (iii) If ,K8RL Ω= find iA and iR

Q.6a. Draw the circuit diagram and frequency response of a single stage RC coupled amplifier. Mark the cut off frequencies and 3 db points. Define the figure of merit for an amplifier.

b.The bandwidth of an amplifier extends from 20 Hz to 20 KHz. Find the frequency range over which the voltage gain is down less than 1dB from its mid band value.

Page 8: AE53/AC53/AT53 ELECTRONIC DEVICES & CIRCUITS DEC 2014 … · Briefly discuss: (i) Superposition theorem (ii) Maximum power transfer theorem ... shown in Fig.1. Ans- c. Find the current

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Q.7 a. With a circuit diagram, explain the working of a complementary symmetry power amplifier. What are its specific advantages?

b.What is cross over distortion? How it could be reduced? Explain with waveforms.

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c. Calculate the peak power dissipated in each transistor of a class B push pull amplifier if V15VCC = and Ω= 5'RL .

Q.8 a. Discuss the importance, types and characteristics of feedback in amplifiers.

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b.An amplifier without feedback gives a fundamental output of 36V with 7% second harmonic distortion when the input voltage is 0.028V (i) If 1.2% of the output is feedback into the input of a negative voltage series circuit, what is the output voltage? (ii) If the fundamental output is maintained at 36V but the second harmonic distortion is reduced to 1%, what is the input voltage?

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Q.9 a. Discuss how IC’s could be classified. b.Reason out why it is not feasible to integrate inductors. c.Why MOSFETs are preferred over BJTs for IC fabrication? d. With neat sketches, explain the steps involved in IC fabrication.

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Textbook

I. Electronic Devices and Circuits, I. J. Nagrath, PHI (2007)


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