MU Discrete Electronic Circuits - May 2012 Exam Question Paper

MU Electronics Engineering (Semester 4)
Discrete Electronic Circuits
May 2012

Total marks: --
Total time: --

INSTRUCTIONS
(1) Assume appropriate data and state your reasons
(2) Marks are given to the right of every question
(3) Draw neat diagrams wherever necessary

Answer any four of the following:-

1 (a) Explain differential amplifier with active load.

5 M

1 (b) What is cross-over distortion in class B power amplifier? Explain with waveform?

5 M

1 (c) State advantages of negative feedback on performance of amplifier.

5 M

1 (d) For the circuit given below calculate dc bias voltages V_B1, V_B2 and V_C2.

5 M

1 (e) For the circuit given below determine the 3dB frequencies and the bandwidth.

5 M

2 Design a two stage RC coupled amplifier for following requirements:
F_L better than 15 Hz. A_v ≥ 1500
S_Ic < 8, R_i ≥ 1MΩ
V_cc=6 V
Select transistor from the table at the end of question paper.

20 M

3 (a) Explain Class B Push Pull amplifier and derive the expression for maximum efficiency.

10 M

3 (b) For the given differential amplifier determine dc voltages, currents and single ended output voltage V₀₁.

10 M

4 (a) For Class B amplifier with V_cc=20V driving an 16Ω, determine:-
(i) Maximum input power.
(ii) Maximum output power.
(iii) Maximum circuit efficiency.
(iv) Transistor dissipation.

10 M

4 (b) Explain high frequency analysis of a BJT amplifier. Derive necessary expressions.

10 M

5 (a) Draw the circuit diagram of Wein Bridge Oscillator and explain its working. Derive the necessary equation for frequency of oscillations and for sustaining oscillations.

10 M

5 (b) For the following circuit, determine
A, β, A_f, Z_if, Z_of, and A_vf.

10 M

6 (a) Determine the lower cut-off frequency for the following network.

10 M

6 (b) For a current series negative feedback amplifier, derive the expression for the input and output resistances with feedback and comment on the result.

10 M

Write short notes on any three:-

7 (a) Heat sink and its design steps.

7 M

7 (b) CMRR improvement in differential amplifier.

7 M

7 (c) Nyquist stability criterion.

7 M

7 (d) Crystal Oscillator.

7 M

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