STUPIDSID
1 (a)
Explain the following with respect to semi conductor diode:
i) Diffusion capacitance
ii) Transition capacitance
iii) Reverse recovery time.
i) Diffusion capacitance
ii) Transition capacitance
iii) Reverse recovery time.
6 M
1 (b)
Explain the working of bridge rectifier.
8 M
1 (c)
Design a suitable circuit represented by the box shown below which has input and output waveforms as indicated.
Q.1(C)
Q.1 (C)(ii)
6 M
2 (a)
Derive an expression for IB, IC and VCE for voltage divider bias using exact analysis.
10 M
2 (b)
For the circuit shown below determine (i) Ia (ii) IC (iii) VCE.
2(b)
2(b)(ii)
6 M
2 (c)
Determine RB and RC for the transistor inverter of Fig. Q2(c) if IC(sat)=10 mA. IB=150 IB|max|.
4 M
3 (a)
Derive an expression for Av, Z1 and Zo for CE fixed bias using rc equivalent model.
10 M
3 (b)
For the circuit shown in Fig. Q3 (b), calculate re, Z1, ZO, AV, AI.
B=200, VCC=0.7V, ro=60kΩ
10 M
4 (a)
Determine the lower cut off frequency for the emitter follower using BJT amplifier with Cs=0.1 μf. Rs=1 KΩ. R1=120 KΩ. R1=4KΩ. RF=1.5 KΩ. CC=0.1 μf. β=100 ro&infty;, VCC=15V. VBF=0.7V.
12 M
4 (b)
Derive equation for Miller input and output capacitance.
8 M
5 (a)
Derive an expression for Zi, Av, At for Darlington emitter follower circuit.
10 M
5 (b)
What are the effects of negative feedback in amplifier? Show how bandwidth of an amplifier increase with negative feedback.
10 M
6 (a)
With a neat diagram explain the working of complementary symmetry push pull amplifier.
10 M
6 (b)
Explain the operation of class B push pull amplifier and show that its efficiency is 78.5% at maximum power dissipation.
10 M
7 (a)
With a neat diagram explain the working of RC phase shift oscillator.
8 M
7 (b)
With a neat diagram explain the working of series resonant crystal oscillator. A crystal has L=0.334 H, C=0.065 pf, CM=1 pf, R=5.5 kΩ. Calculate its series and parallel resonating frequency.
12 M
8 (a)
Draw the JEET amplifier using fixed bias configuration. Derive Zi, ZO and AV using small signal model.
10 M
8 (b)
For the JFET amplifier shown in Fig. Q3(b). calculate (i) gm (ii) rd (iii) Zi (iv) Zn (v) Av
IPSS=5mA
VP=-6V
YOS=40 μs
IPSS=5mA
VP=-6V
YOS=40 μs
10 M
More question papers from Analog Electronics