STUPIDSID
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 VB1, VB2 and VC2.
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:
FL better than 15 Hz. Av ≥ 1500
SIc < 8, Ri ≥ 1MΩ
Vcc=6 V
Select transistor from the table at the end of question paper.
FL better than 15 Hz. Av ≥ 1500
SIc < 8, Ri ≥ 1MΩ
Vcc=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 Vcc=20V driving an 16Ω, determine:-
(i) Maximum input power.
(ii) Maximum output power.
(iii) Maximum circuit efficiency.
(iv) Transistor dissipation.
(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, Af, Zif, Zof, and Avf.
A, β, Af, Zif, Zof, and Avf.
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
More question papers from Discrete Electronic Circuits