ELECTRONIC DEVICES and CIRCUITS , Study notes of Analysis and Design of Digital Integrated Circuits

Download ELECTRONIC DEVICES and CIRCUITS and more Study notes Analysis and Design of Digital Integrated Circuits in PDF only on Docsity! Code No: R07A1EC06 Set No. 1 I B.Tech Semester Regular Examinations, June 2009 ELECTRONIC DEVICES AND CIRCUITS (Common to ECE, CSE, EIE, BME, IT, E.CON.E, CSS, ETM, ECC and ICE) Time: 3 hours Max Marks: 80 Answer any FIVE Questions All Questions carry equal marks ⋆ ⋆ ⋆ ⋆ ⋆ 1. Analyse the two dimensional motion of an electron in electric field. [16] 2. (a) Explain about semiconductor, Insulator & Conductor with neat sketch. (b) State the Einstein relationship for semiconductor. (c) State paulis exclusion principle. [6+5+5] 3. Draw the circuit diagram of a FWR: (a) With centre tap connection and (b) Bridge connection and explain its operation. [16] 4. With necessary diagram explain the input & output characteristics of common emitter configuration. [16] 5. (a) What is the importance of dc load line? (b) The figure 5b shows that D.C bias circuit of a common Emitter transistor amplifier. Find the percentage changer in collector current, if the transistor with HFE = 50 is replaced by another transistor with HFE = 150. It is given that the base emitter drop VBE = 0.6V. [8+8] 1 of 2 Code No: R07A1EC06 Set No. 1 Figure 5b 6. (a) Draw the low frequency hybrid equivalent. Circuit for CE & CB amplifier. (b) Give the approximate h-parameter conversion formulae for CB and CC con- figuration in terms of CE. (c) Give the advantages of h-parameter analysis. (d) Give the procedure to form the approximate h - model from exact h - model of amplifier. [4+6+3+3] 7. (a) How the distortion is decreased in negative feedback? (b) An amplifier has an open loop gain of 1000 and a feedback ration of 0.04. if the open loop gain changes by 10% due to temperature, find the percentage change in gain of he amplifier with feed back. [10+6] 8. Draw a neat circuit diagram of RC phase shift oscillator using BJT and explain its working principle. [16] ⋆ ⋆ ⋆ ⋆ ⋆ 2 of 2 Code No: R07A1EC06 Set No. 3 I B.Tech Semester Regular Examinations, June 2009 ELECTRONIC DEVICES AND CIRCUITS (Common to ECE, CSE, EIE, BME, IT, E.CON.E, CSS, ETM, ECC and ICE) Time: 3 hours Max Marks: 80 Answer any FIVE Questions All Questions carry equal marks ⋆ ⋆ ⋆ ⋆ ⋆ 1. (a) What is deflection Defocusing? Give the reasons of defocusing. (b) Compare: Electrostatic deflection and magnetic deflection (c) An electron beam is deflected of 100 degrees when it traverses in uniform magnetic field, 3 cm wide, having a density of 0.6 mT. Calculate: i. The speed of the electrons and ii. The force on each electron. The direction of the beam is normal to that of the flux. [4+6+6] 2. (a) Explain about diffusion capacitance in detail. (b) Derive an expression for diffusion capacitance. [5+11] 3. Derive all the necessary parameters of HWR. [16] 4. (a) Define a Transistor. (b) What are the differences between Bipolar Junction transistor & Field effect Transistor? (c) Write any two applications of transistor. [5+7+4] 5. (a) Explain the simpler way of drawing dc load line. (b) Calculate the de bias voltage and currents in the circuit shown in figure 5b (Neglect VBE Of Transistor). [8+8] 1 of 2 Code No: R07A1EC06 Set No. 3 Figure 5b 6. Derive the expressions for voltage gain, current gain, I/P impedance, O/P im- pedance of CE amplifier, using exact & approximate model. [16] 7. The open loop gain of an amplifier is 50 and its bandwidth is 20 kHz. When a negative feedback is applied the bandwidth is increased to 25kHz (by 5 kHz). What will be the required feedback? [16] 8. (a) Define: i. Damped Oscillation ii. Un Damped oscillation. (b) Why an LC tank circuit, once excited, does not produce sustained oscillation? Explain it briefly? (c) Give the two Bark Hansen condition required for sinusoidal oscillations to be sustained. (d) What are the factors which affect the frequency stability of an oscillator? [4+6+2+4] ⋆ ⋆ ⋆ ⋆ ⋆ 2 of 2 Code No: R07A1EC06 Set No. 4 I B.Tech Semester Regular Examinations, June 2009 ELECTRONIC DEVICES AND CIRCUITS (Common to ECE, CSE, EIE, BME, IT, E.CON.E, CSS, ETM, ECC and ICE) Time: 3 hours Max Marks: 80 Answer any FIVE Questions All Questions carry equal marks ⋆ ⋆ ⋆ ⋆ ⋆ 1. Derive the expression for the deflection in an electrostatic deflection system. Hence obtain the expression for electro static deflection sensitivity. [16] 2. (a) Define Mass Action Law. (b) Explain N type & P type Semiconductors. [4+12] 3. (a) Write a short notes on multiple L- Section and multiple Π - Section Filter. (b) Compare all the filter circuits from the point of view of ripple factor. [10+6] 4. (a) Define DC drain resistance. (b) Define AC drain resistance. (c) Define trans conductance. (d) Define amplification factor. [4+4+4+4] 5. (a) Find the collector current and collector to emitter voltage for the given circuit as shown in figuer 5a. Figure 5a (b) Can the value of stability factor be less than unity? Explain briefly. [10+6] 1 of 2