ESC201A-Endsem_paper 2014.pdf

# Also identify and determine the description of the

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of each individual asymptote. Also identify and determine the description of the overall transfer function ( ) H j ω . [4] 0 20 40 60 80 -20 -40 Mag (dB) ω (rad/sec) -60 -80 1 10 10 2 10 3 10 4 10 5 ω 1 ω 2 I II III Fig. 2(b)

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Dept. of EE, IIT Kanpur. End Sem Exam 2014 ESC 201A: Introduction to Electronics 3 3) The circuit in Fig. 3(a), has the magnitude-frequency curve as shown in Fig. 3(b) (linear coordinates). The input voltage is v s ( t ) = V s cos( ω t ) and ω c = 1 × 10 6 rad / s ω + = 1.05 × 10 6 rad / s ω = 0.95 × 10 6 rad / s (a) Find the values of L and C. (b) Sketch the 0 V vs. ω . (c) If v s = 10 cos(10 6 t ) , calculate v c ( t ), i ( t ), and v O ( t ). (d) For v s = 10 cos(10 6 t ), Determine the total stored energy W s and time-averaged power dissipated. [7] v O R = 100 Ω i L C v c v s ( t ) v s (t) = V s cos ( ω t) Fig. 3(a) ω 1 0.707 ω c ω + ω _ s V V 0 Fig. 3(b)
Dept. of EE, IIT Kanpur. End Sem Exam 2014 ESC 201A: Introduction to Electronics 4 4) Sketch I R and V 0 for the network of Fig. 4 for the input shown. Assume V γ = 0.7 V and resistance of the diode under conduction is zero . [7] V i 10 k Ω I R 5.3 V 7.3 V Si Si V 0 Fig. 4 5) (a) In the circuit shown in Fig. 5(a), determine the mode of operation of the transistor, the collector current I C and the voltage at the emitter V E . Assume that V BE = 0.7 V both in active and saturation modes and V CE,sat = 0.2 V. [3] 5 k Ω 600 Ω 400 Ω 5 V B C E β =50 Fig. 5(a) (b) Find the value of I C shown in the Fig. 5(b) considering the transistor to be in the active mode. Given R 1 = 20 k Ω and R 2 = 5 k Ω . Assume V BE = 0.7 V. [3]

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Dept. of EE, IIT Kanpur. End Sem Exam 2014 ESC 201A: Introduction to Electronics 5 R E β = 100 R 1 R 2 = 100 Ω V EE = -12 V = 12 V V CC I C = 1 k Ω R
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