Download GTU BE/B.Tech 2019 Winter 4th Sem Old 141101 Advance Electronics Question Paper

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GUJARAT TECHNOLOGICAL UNIVERSITY

BE - SEMESTER- IV (Old) EXAMINATION — WINTER 2019

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Subject Code: 141101

Subject Name: Advance Electronics

Time: 10:30 AM TO 01:00 PM

Instructions:

1. Attempt all questions.

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2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.

1. Q.1 (a) List the parameters those affecting to the transistor at high frequencies. MARKS 07

   (b) Draw hybrid p model equivalent circuit for common emitter transistor and explain it. 07

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2. Q.2 (a) Explain how the performance of an amplifier improves with negative feedback? Derive the expression of voltage gain and input impedance of voltage series feedback. 07

   (b) Derive current gain of common emitter with resistive load (R_L). Draw frequency response of it with effect of R_L. 07

3. Q.3 (a) What is Common Mode Rejection Ratio (CMRR)? What is the significance of CMRR? List and Explain the methods to improve the CMRR. 07

   OR

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   (a) Define the following terms:

   1. Common Mode Gain
   2. Differential Gain
   3. Virtual Ground concept of OP-AMP
   4. Noise margin

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   5. Fan-out
   6. PSRR
   7. Figure of merit for logic families
   07

4. Q.4 (a) Four identical amplifier stages are cascaded. The lower and upper 3 dB frequencies of each stage are 40Hz and 20Khz respectively. Calculate the overall bandwidth of the cascaded amplifier. 07

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   (b) Draw and explain two stages' RC coupled amplifier. List the parameters affecting the low frequency response of RC coupled amplifier. 07

   OR

   (a) If an amplifier has a bandwidth of 200 KHz and a voltage gain of 100, what will be the new bandwidth and gain if 5% negative feedback is introduced? What is the product of gain and bandwidth before and after the negative feedback? 07

5. Q.5 (a) Explain important characteristics of ideal Op-Amp. 07

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   (b) Draw the circuit of RC phase shift oscillator and explain the principle of operation of RC phase shift oscillator. 07

6. Q.3 (a) Draw OP AMP based close loop inverting amplifier with input output waveform. Derive the gain equation of inverting amplifier. 07

   OR

   (a) Draw the internal block diagram of OP-AMP and explain function of each block. 07

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7. Q.4 (a) What is oscillator? Explain the concept of oscillation with Barkhausen criteria. 07

   (b) What is Digital to Analog Convertor? Draw and Explain weighted resistor DAC. 07

8. Q.5 (a) Explain different biasing methods of BJT. Explain voltage divider biasing method with advantages and disadvantages. 07

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   OR

   (a) Mention the types of ADC and describe successive approximation types of ADC. 07

   (b) Tabulate the compare of TTL, CMOS, and ECL logic families based on speed, fan-in, fan-out, noise immunity, power dissipation, and application. 07

Date: 13/12/2019

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Total Marks: 70

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