STUPIDSID
1(a)
Explain Reverse recovery time of a semiconductor diode.
6 M
1(b)
The Fig. Q1 (b) shows two way clipper. Determine its output wave form. Assume diode drop of 0.7V.
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7 M
1(c)
What is clamper circuit? Explain the operation of Positive and Negative clamper circuit and draw the wave form. [Assume Ideal Diode].
7 M
2(a)
What is transistor? Discuss the causes of bias instability in a transistor.
6 M
2(b)
Derive the expression for IB, VCE and S(ICO) for voltage divider bias using exact analysis.
7 M
2(c)
For the circuit shown in Fig. Q2. Find IB, IC, VCE, VC and VE. Assume β = 100. VBE = 0.7.
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:!mage
7 M
3(a)
For common base configration shown in Fig. Q3(a). Find re, zi, z0 and Av.
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:!mage
6 M
3(b)
Derive an expresion for zi, z0, Av and Ai of a CE fixed bias configuration using re model.
7 M
3(c)
Using h-parameter model for a transistor in C.E. configuration. Derive expression for AI, zi and Av.
7 M
4(a)
An amplifier consists of 3 identical stages in cascade; the bandwidth of overall amplifier extends from 20Hz to 20KHz. Calculate the band width of individual stage.
6 M
4(b)
Describe miller effect and derive an equation for miller input and output capacitance.
7 M
4(c)
Draw and explain frequency response of an amplifier and briefly discuss the effect of various capacitors on frequency response.
7 M
5(a)
Explain the need of cascade amplifier and list the advantage of this circuit.
6 M
5(b)
With block diagram, explain the concept of feedback. List the advantages of negative feedback.
7 M
5(c)
Derive the expression for input resistance (Rif) for voltage series feedback amplifier.
7 M
6(a)
Draw input and output wave forms of class - A, Class - B and Class - C power amplifiers based on the location of Q - point, and briefly discuss.
6 M
6(b)
Draw the circuit diagram of series fed directly coupled Class - A amplifier. Give the expression for dc power input and a.c power output and show that efficiency is 25%.
7 M
6(c)
What is Harmonic distortion? Calculate the harmonic distortion components for an output signal having fundamental amplitude of 2.5V second harmonic amplitude of 0.25V, third harmonic amplitude of 0.1V and fourth harmonic amplitude of 0.05V. Also calculate the total harmonic distortion.
7 M
7(a)
With neat circuit diagram explain the operation of BJT Hartley oscillator.
6 M
7(b)
i) The frequency sensitive arms of the bridge oscillator uses C1 = C2 = 0.001μF and R1 = 10KΩ while R2 is kept variable. The frequency is to be varied from 10KHz to 50KHz by varying R2. Find the minimum and maximum values of R2.
ii) Design the value of an inductor to be used in Colpitts oscillator to generate a frequency of 10MHz. The circuit is used a value of C1 = 100pF and C2 = 50pF.
ii) Design the value of an inductor to be used in Colpitts oscillator to generate a frequency of 10MHz. The circuit is used a value of C1 = 100pF and C2 = 50pF.
7 M
7(c)
With neat circui explain the working of series resonant crystal oscillator. A crystal has L = 0.1H, C = 0.01pF find the series resonating frequency.
7 M
8(a)
Define transconductance gm and derive expression for gm.
6 M
8(b)
With equivalent model of JFET common drain configuration. Obtain the expression for zi, z0, Av.
7 M
8(c)
For common gate amplifier as shown in Fig Q8(c), gm = 2.8ms, rd = 50kΩ Calculate zi, z0, Av.
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:!mage
7 M
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