B.TECH - Semester 4 electronics circuits Question Paper 2019 (jun)
Practice authentic previous year university questions for better exam preparation.
Sample Questions
- Draw the basic MOS differential pair configuration and derive the expressions for input common-mode range.
- Explain the operation of BJT differential amplifier in differential mode with circuit diagram.
- Write short notes on synchronous tuning.
- Discuss the properties of negative feedback.
- Explain about phase and gain margin with neat diagram.
- Explain the stability analysis of feedback amplifiers.
- Explain the Barkhausen criterion for sustained oscillator.
- Determine the operating frequency of a Colpitts oscillator for C1 $=750 \mathrm{pF}$, $\mathrm{C} 2=2500 \mathrm{pF}$ and $\mathrm{L}=40 \mu \mathrm{H}$.
- Draw the circuit diagram of monostable multivibrator and explain its operation.
- Explain the bootstrap sweep circuit. ( $\mathbf{1 0} \boldsymbol{\times} \mathbf{4} \boldsymbol{=} \mathbf{4 0}$ Marks) Answer any two questions from each Module. Each question carries 10 marks.
- Explain the small signal operation of MOS differential pair. Derive differential gain, common mode gain and CMRR.
- Explain the transfer characteristics of differential amplifier and its frequency response.
- Consider an active-loaded MOS differential amplifier of the type shown in fig. 1. Assume that for all transistors. $W / L=8.2 \mu \mathrm{~m} / 0.36 \mu \mathrm{~m} . C_{g s}=20 \mathrm{fF}, C_{g d}=5 \mathrm{fF}$ and $C_{d b}=5 \mathrm{fF}$.Also, le...
- An amplifier has a voltage gain of -100 . The feedback ratio is -0.04 . Find (a) the voltage gain with feedback,
- An amplifier has a voltage gain of -100 . The feedback ratio is -0.04 . Find (b) the amount of feedback in dB,
- An amplifier has a voltage gain of -100 . The feedback ratio is -0.04 . Find (c) the output voltage of the feedback amplifier for an input voltage of 40 mV ,
- An amplifier has a voltage gain of -100 . The feedback ratio is -0.04 . Find (d) the feedback factor, and
- An amplifier has a voltage gain of -100 . The feedback ratio is -0.04 . Find (e) the feedback voltage.
- Explain frequency compensation in feedback amplifiers with neat diagrams.
- Draw the circuit of a cascade amplifier. Derive expression for voltage gain of a cascade amplifier.
- What is the need for crystal oscillator? Draw the equivalent circuit of crystal. With one example. explain the principle of operation of crystal oscillator. Also calculate series resonance and parallel resonance frequencies of crystal oscillator.
- Draw the circuit diagram of collector coupled astable and bistable multivibrator and explain their operation.
- Explain the generation of a standardized pulse using one-shot multivibrator. ( $\mathbf{6} \boldsymbol{\times} \mathbf{1 0} \boldsymbol{=} \mathbf{6 0}$ Marks)