STUPIDSID
Answer any one question from Q1 and Q2
1 (a)
Draw h-parameter models for CE, CB and CC transistor configurations.
6 M
1 (b)
For the circuit shown in Fig 1. Silicon transistor with β=100 is used. Calculate IB, ,IC and VCE.
6 M
2 (a)
For the circuit shown in Fig 1. Silicon transistor with hie=1.1 KΩ, hfe=50, hre=2.5×10-4, hoe=25 μA/V is used. Calculate Ai, Av, Ri, Ri', R0 and R0'.
6 M
Answer any one question from Q3 and Q4
3 (a)
Draw and explain Hartley oscillator using BJT. Calculate frequency of oscillation, when C=0.001 μF, L1=L2=100 μH and mutual inductance between L1 and L2 is 20 μH.
6 M
3 (b)
Derive the expression for lower cut-off frequency and higher cut-off frequency in terms of percentage tilt and rise time respectively.
6 M
4 (a)
Determine the input resistance of a series input connection and the output resistance of a shunt output connection for an ideal feedback voltage amplifier in which Av=105 and Aof=50. Assume that input and output resistances of the basic amplifier are Ri=10 KΩ and R0=20 KΩ respectively.
6 M
4 (b)
Explain the effect of internal capacitance of transistor used in amplifier circuit on bandwidth of amplifier with frequency response curve. Define Fα and Fβ separately.
6 M
Answer any one question from Q5 and Q6
5 (a)
Draw class B push pull power amplifier and show that
Maximum efficiency is 78.5%.
6 M
5 (b)
A transformer coupled class A power amplifier draws a current of 200 mA from a collector supply of 10 V when no signal is applied to it. Determine:
i) Maximum output power
ii) Maximum collector efficiency iii) Power rating of the transistors. If the load connected across transformer. Secondary is of 2Ω and transformer turns ratio is 5:1.
i) Maximum output power
ii) Maximum collector efficiency iii) Power rating of the transistors. If the load connected across transformer. Secondary is of 2Ω and transformer turns ratio is 5:1.
7 M
6 (a)
Explain with circuit diagram, how even harmonics are eliminated in class B push-pull power amplifier.
6 M
6 (b)
A sinusoidal signal VS=1.75 sin (600 t) is fed to a power amplifier. The resulting output current is I0=15 sin 600 t + 1.5 sin 1200 t+1.2 ssin 1800 t + 0.5 sin 2400 t. Calculate the percentage increase in the power due to distortion.
7 M
Answer any one question from Q7 and Q8
7 (a)
Explain various non-ideal current voltage characteristics of EMOSFET.
6 M
7 (b)
For the circuit shown in Fig 2. the MOSFET parameters are VT=3V, k=0.4 mA/V2. Determine VGS, VDS and ID and show that MOSFET is biased in the saturation region:
7 M
8 (a)
For the circuit shown in the Fig 2, determine gm, AD, Ri, Ri', R0 and R0'. Given VT=3V, k=0.4 mA/V2 and r0=40 KΩ.
7 M
8 (b)
Describe Bi-CMOS technology of MOSFET with circuit diagram.
6 M
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