(SEM III) THEORY EXAMINATION 2023-24 ANALOG ELECTRONICS CIRCUITS

This question paper is designed for the B.Tech (Semester III) Theory Examination 2023-24 for the subject Analog Circuits & Amplifiers. The paper evaluates a student’s understanding of fundamental and advanced concepts of analog electronics, including biasing techniques, transistor models, feedback mechanisms, oscillators, current mirrors, and differential amplifiers.

The question paper is divided into three structured sections, each targeting different levels of cognitive ability—from basic definitions to analytical and design-based questions.

SECTION A – Conceptual & Short Answer Questions (14 Marks)

This section consists of seven brief questions, each carrying 2 marks, and focuses on essential definitions and fundamental concepts.
Students are tested on topics such as:

Bias stability in transistor amplifiers

Transconductance and cascode configurations

Types of oscillators

Barkhausen criterion

Differential amplifier characteristics (CMRR, ICMR)

Difference between inverting and non-inverting amplifiers

These questions check the student’s clarity of foundational principles.

SECTION B – Descriptive & Analytical Questions (21 Marks)

Students must attempt any three out of five questions, each carrying 7 marks.
These questions require detailed explanations, derivations, comparisons, and circuit-level reasoning.
Topics include:

BJT biasing schemes with advantages and disadvantages

Feedback topologies in amplifiers and their effects

Colpitts oscillator analysis including frequency derivation

Current mirror characteristics and load limitations

Schmitt trigger operation and applications

This section tests the student’s ability to analyze circuits, understand device behavior, and explain practical implementation.

SECTION C – Advanced & Application-Oriented Questions (21 Marks)

This section contains five sets, each with two choices, and the student must attempt one question from each set.
Each question carries 7 marks.
This part examines deeper understanding of:

Small-signal models and amplifier behavior

FET biasing methods

High-frequency transistor models and amplifier frequency response

Effects of feedback on gain, bandwidth, stability, gain margin & phase margin

Non-sinusoidal oscillators for generating waveforms like square and triangular signals

Barkhausen criterion and oscillator fundamentals

Questions in this section emphasize problem solving, circuit modelling, frequency response analysis, and conceptual clarity required for practical analog design.

Overall Purpose of the Question Paper

This paper aims to thoroughly assess students on:

Understanding of transistor operation and amplifier design

Ability to derive formulas and analyze electronic circuits

Knowledge of feedback, oscillators, and stability criteria

Skill to interpret device characteristics and apply theoretical models

Practical reasoning relating to the behavior of analog circuits

The structure ensures a balanced evaluation of memory, understanding, application, analysis, and design skills.