Elec Circuits & Comm. Fundamentals - Dec 2012

Computer Engineering (Semester 3)

TOTAL MARKS: 80
TOTAL TIME: 3 HOURS (1) Question 1 is compulsory.
(2) Attempt any three from the remaining questions.
(3) Assume data if required.
(4) Figures to the right indicate full marks. 1(a) Draw equivalent circuit diagram of Op-Amp and explain each term(4 marks) 1(b) Compare BJT and FET(4 marks) 1(c) Design practical differentiator for the frequency 5KHz(4 marks) 1(d) Explain virtual short and virtual ground concept(4 marks) 1(e) Using practical Op-Amp realize following relation: V₀=2V₁ + 5V₂ + 7V₃ - V₄(4 marks) 2(a) Explain the Graphical determination of the h parameters using characteristics curves of CE amplifier(10 marks) 2(b) Determine V_c and V_B for the network shown in figure:
(10 marks) 3(a) Explain the terms CMRR, PSRR(5 marks) 3(b) For the network shown in figure, determine I_D, V_GS, V_G, V_D, V_S and V_DS
(15 marks) 4(a) Explain any two applications of astable multivibrator using IC 555(10 marks) 4(b) Design a regulator using LM 723 for V₀=9V and I₀=3 Amps.(10 marks) 5(a) Draw and explain successive approximation resister type ADC(10 marks) 5(b) Explain how an Op-Amp can be used as
i. Practical Integrator
ii. Schmitt Trigger(10 marks) 6(a) Explain Instrumentation Amplifier using Transducer bridge circuit(10 marks) 6(b) Explain how Op-Amp can be used as summing, scaling and averaging amplifier in Inverting configuration(10 marks) 7(a) Features of timer(5 marks) 7(b) PLL(5 marks) 7(c) Properties of Ideal Op-Amp(5 marks) 7(d) Zero crossing detector(5 marks) 7(e) Construction of n-channel JFET(5 marks)