STUPIDSID
1(a)
Design two stage R-C coupled amplifier using BC-547 transistor for the following parameter;AV ≥ 600,Vcc=12V,SICO≤10,lower cutoff frequency F1=10Hz.
15 M
1(b)
For the above designed amplifier determine Av,VOmax,Rin, and Ro.
5 M
2(a)
Design large signal transformer coupled class A power to the 4ohms load.
10 M
2(b)
For the differential shown in fig.1 determine:,br>D C bias condition
Differential mode gain Ad,
Common mode gain AC and
Differential mode impedance and output impedance
10 M
3(a)
A three stage RC coupled amplifier uses FET with the following parameters:g_{m}=2.5 mA/V,r_{d}=7.5k&Omega,RD=10kΩRG=1.2MΩcoupling capacitor Cc=0.005μf and Cs=&infty.Evaluate
The overall mid-band voltage gain in dB
Lower 3dB frequency of individual stages and
Overall lower 3db frequency.
The overall mid-band voltage gain in dB
Lower 3dB frequency of individual stages and
Overall lower 3db frequency.
8 M
3(b)
Draw two stage CE amplifier and derive the expression for
Small signal mid-band voltage gain
Input impedance and
Output impedance.
Small signal mid-band voltage gain
Input impedance and
Output impedance.
12 M
4(a)
For the feedback amplifier shown in fig.2(i)Identify the type of feedback and
(ii)Derive the expression for AVF,RIFand ROFusing negative feedback approach.
12 M
4(b)
Explain the working principle of a wein bridge oscillator.Derive the expression for the frequency of oscillation and the value of gain required for sustained oscillation.
8 M
5(a)
Enumerate the effects of negative feedback on
gain
frequency response
Distortion
Noise and
Input and output impedance.
gain
frequency response
Distortion
Noise and
Input and output impedance.
8 M
5(b)
For the amplifier shown in fig.3 determine VB1,VB2,ICQ,Av,Ri and Ro
12 M
6(a)
Draw the circuit diagram for class B push -pull amplifier and derive the expression for conversion efficiency.
10 M
6(b)
With neat sketch,explain the working of an emitter coupled astable multivibrator.State the advantages of emitter coupled astable multivibrator.
10 M
Write a short note on following
7(a)
Colpitts oscillator
5 M
7(b)
Frequency response of R-C,Direct coupled transformer coupled amplifier
5 M
7(c)
Crossover Distortion in power amplifier.
5 M
7(d)
Class C power amplifier.
5 M
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