Subject Code & Name: VL25302 – Analog Circuits
Regulation: R-2025
Semester: III (Third Semester)
Branch: B.E. Electronics Engineering (VLSI)
Credits / L-T-P: 3 Credits | L-T-P: 3-0-0
Course Objectives
- This course introduces the fundamentals of analog circuits using diodes, BJTs, and MOSFETs.
- It covers the design and analysis of biasing methods, amplifier configurations, multistage and differential amplifiers, feedback systems, and waveform generators.
- Students will design and simulate analog circuits using open-source tools to support theoretical understanding and practical skills.
Full Unit-wise Syllabus
Unit I – Diode and Filter Circuits
Diode circuits - clipper, clamper, voltage doubler, voltage quadrupler, half-wave rectifier, centre-tapped full-wave rectifier, and bridge rectifier circuits, Power supply design. Regulators – Voltage regulator circuits using Zener diode. Passive filters – analysis of RC, RL, RLC filters.
Activities: (Model Making): Design and simulation of clipper and Bridge rectifier circuits using LTspice (open source) Design and analysis of different passive filter circuits using LTspice. (i) Design of a 5V regulated DC power supply. (ii) Design and analyze the frequency response of basic passive filter circuits.
Unit II – BJT and MOSFET Circuits
BJT Circuits - Load-line analysis, different biasing techniques of BJT, bias stabilization, and early effect, RC-coupled and transformer-coupled multistage amplifiers, and current mirror circuits. MOSFET circuits – Biasing by fixing VGS, biasing by fixing VG, and connecting a resistor in the source, Biasing using a drain-to-gate feedback resistor, and biasing using a current source. Analysis and design of common source, common drain, common gate amplifier configurations.
Activities: (Flipped classroom and Quiz): Flipped classroom is followed by a quiz where students learn amplifier circuits through pre-class study and apply concepts in solving and analyzing problems in class. (i) Study of different BJT biasing techniques and analyze their effect on stability. (ii) Design and test of Common-Source amplifier.
Unit III – Frequency Response of Amplifiers
Frequency response of amplifiers – Low frequency response of BJT and FET amplifiers, lower cut off frequency - hybrid π equivalent circuit of BJT - high frequency response of BJT amplifiers –upper cut off frequency – transition frequency - Miller effect, high frequency response of FET amplifiers. Wide band amplifiers - Wide banding techniques – CC–CE /CD-CS cascade, cascade amplifier, Darlington pair.
Activities: (Flipped classroom and Quiz): Flipped classroom followed by a quiz where students learn differential amplifiers through pre-class study and apply concepts in solving and analyzing problems in class. (i) Study of frequency response of single-stage BJT and FET amplifiers. (ii) Design and analysis of Darlington amplifier circuits.
Unit IV – Feedback Amplifiers and Waveform Generators
Feedback and stability- negative and positive feedback in amplifiers, analysis of four feedback topologies, loop gain. Oscillators - Barkhausen criterion, effect of feedback on amplifier poles, Bode plots, gain and phase margins; positive feedback and sinusoidal oscillators using BJT - Wein bridge oscillator, RC phase shift oscillator, Hartley and Colpitts oscillators. Multivibrators using BJT – astable,monostable, and bistable circuits.
Activities: (Model Making & Seminar Presentation): Design and analysis of a high-frequency Hartley oscillator using LTspice. And a technical seminar presentation on the design methodology of multivibrator circuits. (i) Study of Feedback Amplifier Topologies and Stability Using Bode Plot. (ii) Design and analysis of multivibrators (astable, monostable, bistable) using BJT.
Unit V – Power Amplifiers
9Power amplifiers –Analysis of Class A, B, AB, C, D & S power amplifiers, Conversion efficiency and relative performance, Total Harmonic Distortion (THD), Relationship Between Total Power and THD, Heat sinks.
Activities: (Model Making): Design and simulation of Class B/AB amplifier using LTspice. (i) Design and Efficiency Analysis of Class B Power Amplifier.
Course Outcomes (COs)
- CO1: Define, understand, and explain concepts related to diode, BJT, and MOS transistor circuits.
- CO2: Apply the knowledge of network theorems and device . models to solve given analog electronic circuits.
- CO3: Design of analog electronic circuits for a given specification and its analysis to compute required parameters.
- CO4: Simulate linear circuits using appropriate EDA tools and implement analog electronics circuits using breadboard.
Assessment Pattern (Quick Note)
- Weightage: Continuous Assessment 40% | End Semester Examinations 60%
- Internal methodology: Assignment (20%), Software activity (20%), Quiz (20%), Internal Examinations (40%)
Source: Official Anna University – B.E. Electronics Engineering (VLSI) R-2025 Curriculum
Last Updated: September 2026
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