B.TECH - Semester 3 solid state devices and circuits Question Paper 2020 (feb)
Practice authentic previous year university questions for better exam preparation.
Sample Questions
- What is stability factor? Discuss various factors affecting the stability of an amplifier.
- Draw the frequency response of a common emitter amplifier and comment on the gain at various frequencies.
- Define cross over distortions and how to overcome the cross over distortion in amplifiers?
- What are the ideal, non-ideal DC and AC characteristics of an operational amplifier?
- Draw the input and output waveform of the inverting summing amplifier with a gain of 3 and the input voltage $V_{1}=2 \sin \omega t, V_{2}=2$. The power supply to op-amp is $+/-15 \mathrm{~V}$.
- Draw the hybrid equipment model of a Bipolar Junction transistor and define various hybrid parameters.
- Determine the frequency of oscillation for RC phase shift oscillator having $\mathrm{R}=10$ Ohms, $\mathrm{C}=0.01 \mu \mathrm{~F}$ and $\mathrm{R}_{\mathrm{c}}=22 \mathrm{k}$ Ohms.
- Draw the circuit of a zero crossing detector using op-amp and draw its output for a sinusoidal input.
- Compare NMOS and CMOS Technology.
- What is thermal Drift, Suggest suitable methods to avid thermal drift? PART - B Answer any two full questions from each Module. Each question carries 10 marks.
- Design a fixed bias circuit using a transistor $\beta=100, V_{c c}=10 \mathrm{~V}$ at the $Q$ point of $(5 \mathrm{~V}, 5 \mathrm{~m} \mathrm{~A})$.
- With necessary equivalent circuits, explain the complete hybrid model of the common emitter BJT amplifier and derive the relation for current gain, voltage gain, input impedance and output impedance.
- Explain the construction of P Channel-MOSFET and discuss on the output characteristics and transfer characteristics.
- Draw the circuit diagram of Voltage divider biasing circuit of a BJT amplifier and derive the expression for the stability factor and comment on the same.
- Discuss briefly on complementary symmetry amplifier.
- Derive the expression for input impedance, output impedance and voltage gain of the current series feed back amplifier voltage series feedback amplifier. Discuss your observations.
- Draw the circuit diagram of class B push pull amplifier and explain its operation and derive its maximum efficiency.
- Write short notes on crystal oscillator, with necessary equivalent circuit derive the expression for the frequency of oscillation.
- Explain the following electrical parameters related to op-amp and suggest a suitable compensation technique (a) Input bias current
- Explain the following electrical parameters related to op-amp and suggest a suitable compensation technique (b) Input offset current.
- Describe the different modes of operation of emitter coupled differential amplifier and show its relation with CMRR.
- Discuss the external frequency compensation methods in operational amplifier.
- Discuss in detail about the astable multivibrator using IC 741.