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Code No.210451

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II-B.Tech. I-Semester Examination Nov/Dec 2002 ELECTRONIC DEVICES (Electronics and Communication Engineering and Electronics and Telematics Engineering) Time:3 hours Max.Marks:70 Answer any FIVE questions All questions carry equal Marks --1.a) Draw the energy band structure in conductors, semiconductors and insulators at a constant temperature. b) Describe Hall effect in semiconductors. Derive an expression for the Hall voltage. What are the parameters that can be measured by this effect.

Derive an expression for electrostatic deflection sensitivity in a cathode ray tube. The distance between the plates of a plane parallel capacitor is 1 cm. An electron starts at rest at the negative plate. If a direct voltage of 1,000V is applied, how long will it take the electron to reach the positive plate?

3.a) b)

Explain the principle and operation of photodiodes. What is the minimum energy, expressed in joules and in electron volts, required to remove an electron from the surface of metallic potassium, the photoelectric threshold wavelength of which is 5,500Ao?

4.a) b)

Derive an expression for transition capacitance of a diode. What are the different breakdown mechanisms. Explain?

5.a)

Derive the expression hFE hfe = -------------------1-( ICBO+ IB) hFE

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2.a) b)

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Explain the current components of p-n-p transistor.

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b) 6.a)

b)

8.

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Explain MOSFET construction. How it can be biased. Explain the operation of PIN diode and how it can be used as switch. Determine the density of donor atoms which has to be added to an instrinsic Ge semiconductor to produce n-type semiconductor of conductivity 5mho/cm. Given that μn = 3850 cm2/v-s. Write short note on: a) Schottky diode (b) Diffusion mechanism (c) UJT and its characteristics. *** *** ***

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7.a) b)

What is FET small-signal model. Derive the expression gm = gmo 1- VGS .

Code No.210451 II-B.Tech. I-Semester Examination Nov/Dec 2002 ...

b) What is the minimum energy, expressed in joules and in electron volts, required · to remove an electron from the surface of metallic potassium, the ...

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