Solve any five :-

1 (a)
Explain effect of temperature on characteristics of PN junction diode.

4 M

1 (b)
Why LC oscillators are prefered for high frequency applications?

4 M

1 (c)
Find R

_{B}and R_{C}for the circuit shown to obtain V_{CE}=5V and I_{C}=2mA

4 M

1 (d)
In n-channel MOSFET V

_{DS}=5V, V_{GS}=5V, V_{BS}=0, W=10 ?m, L=5 ?m k'n=100 mA/V_{2}and V_{TO}=1V. Calculate its drain current for channel length modulation factor ? of 0 and 0.25 V^{-1}
4 M

1 (e)
Draw and explain small signal hybrid-Pi model of BJT including early effect.

4 M

1 (f)
Differentiate between NJT and MOSFET

4 M

2 (a)
Find I

_{CQ}and V_{CEQ}for the circuit shown in figure 2a if ?=100

10 M

2 (b)
Draw and explain energy band diagram of MOS capacitor in accumulation, depletion and inversion region.

10 M

3 (a)
Draw and explain working of transisterized Wien Bridge Oscillator

10 M

3 (b)
The JFET shown in figure 3b has parameter I

_{DSS}=8mA and V_{p}=4V. Determine V_{G}, I_{DSQ}, V_{GSQ}and V_{DSQ}

10 M

4 (a)
For the common gate circuit shown in figure 4s, the NMOS transistor parameters are V

_{TN}=1, kn=3 mA/V^{2}and ?=0 (i) Determine I_{DSQ}and V_{DSQ}(ii) Calculate gm and ro (iii) Find the small signal voltage gain Av= v_{0}/v_{1}. Assume Cc_{1}and Cc_{2}acts as short circuit for small-signal analysis

10 M

4 (b)
The parameter of the transistor in the circuit shown in figure 4b are ?=100 and V

_{A=100V.}(i) Determine the voltages at base and emitter terminals (ii) Find Rc such that VCEQ=3.5V and (iii) Assuming CC and CE acts as short circuit determine small signal voltages gain Av= v0/vs

10 M

5 (a)
Derive expression for voltage gain NMOS source follower cicuit

8 M

5 (b)
For the common base amplifier shown in figure 5b, derive expression for voltage gain, current gain, input resistance and output resistance using hybrid-? model

12 M

Write short note on any three :-

6 (a)
Series and shunt clippers

7 M

6 (b)
Twin-T oscillator

7 M

6 (c)
MOSFET operation

7 M

6 (d)
Construction and operation of varactor diode.

7 M

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