STUPIDSID
1(a)
Explain the following:
i) practical diode model.
ii) ideal diode model.
iii) piecewise linear model.
i) practical diode model.
ii) ideal diode model.
iii) piecewise linear model.
8 M
1(b)
Consider a half wave and full wave rectifier with capacitor input dieter.Derive an expression for ripple factor.
8 M
1(c)
explain the oration of negative circuit.
4 M
2(a)
consider a fixed bias circuit of a transistor.Obtain expressions for stability factor Sico,Svbe and \[s_{b}\].Draw the circuit diagram.
10 M
2(b)
Design n voltage divider bias circuit for the given conditions.\[I_{c}=1mA,\ S_{ico}-20,\beta -100,V_{e}-1\V,V_{ce}-6V\ and \ V_{cc}-12V.\] Draw the circuit diagram.
10 M
3(a)
For the common collector circuit shown in fig.q3 (a) the transistor h-parameters are \[h_{fe}=-101,h_{re}=1,h_{oc-25\mu \ A/V,},h_{ie}=1.2k.\]Determine \[R_{1},A_{i}\ A_{v,}\A\ A_{vs}\ and\ R_{o}\]circuit.
10 M
3(b)
State and prove miller's theorem.
5 M
3(c)
Obtain r-parameter model for GB mode.
5 M
4(a)
Explain the low frequency response of single stage RC coupled amplifier.
10 M
4(b)
an amplifier consists of 3 identical stages in cascade,the bandwidth of overall amplifier extends form 20 Hz to 20 kHz.Determine the bandwidth of individual stage.
5 M
4(c)
For an amplifier,the midland again is 100 and lower cut-off frequency is 1 kHz.calculate the again of the amplifier at frequency of 20 Hz.
5 M
5(a)
consider Darling ton emitter follower circuit.Obtain expressions for \[R_{i2},R_{i1},R_{i2},A_{i1}\\ compare \ R_{i}\ and \ A_{i}/] of each and overall stage if \[R_{e}=3.3k\Omega ,h_{re}-2.5X10^{-4},h_{fe}=50\\ and \ h_{oe}=25\mu \A\V.\]
10 M
5(b)
For a voltage series feedback amplifier topology,obtain expression for\[A_{v} and R_{if}.\] Also explain the principle of voltage amplifier used in feedback amplifiers.
10 M
6(a)
Derive an expression for second harmonic distortion in power amplifiers,using 3-point method.
10 M
6(b)
a complementary symmetry push pull amplifier is operated with \[V_{cc}\]=10V,\[R_{L}=5\Omega\]. Determine maximum output power,power rating of transistors and DC input power.
10 M
7(a)
Explain the concept of positive feedback used in oscillators.
5 M
7(b)
obtain an expression for frequency of oscillation in Colpitt's oscillator.
10 M
7(c)
in a RC phase shift oscillator using transistor,
\[F_{0}=10 kHz,R_{1}=25k\Omega ,R_{2}=57,
\[R_{1}=5\Omega\]. Calculate the capacitor C and \[h_{fe}\].Draw the circuit diagram.
\[F_{0}=10 kHz,R_{1}=25k\Omega ,R_{2}=57,
\[R_{1}=5\Omega\]. Calculate the capacitor C and \[h_{fe}\].Draw the circuit diagram.
5 M
8(a)
Consider a n-channel JEET using voltage divider bias. Explain its DC analysis, Also derive an expression for transconductance gm.
10 M
8(b)
Design a fixed bias circuit of fig.q8 (b) to have ac gain of -15.Calculate the value of \[R_{d}\ to \get\ get\ this\ again,\ if V_{dd}=40V,R_{g}-10\ M\Omega ,I_{dss}-10mA,V_{p}\\ =-4v,Yos=20\mu s,C_{1}=0.1\mu F.\]
10 M
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