EC25C12 Control Systems – Semester IV – ECE / ElecComp – R-2025

Subject Code & Name: EC25C12 – Control Systems

Regulation: R-2025

Semester: IV (Fourth Semester)

Branch: B.E. Electronics and Communication Engineering (ECE) / B.E. Electronics and Computer Engineering (ElecComp)

Credits / L-T-P: 3 Credits | L-T-P: 3-0-0

Course Objectives

• Model physical systems using differential equations, transfer functions, and state-space, then analyze time/frequency behavior to design stable, high-performance controllers.

Full Unit-wise Syllabus

Unit I – Introduction To Control System

Fundamental concepts of Control Systems: open loop and closed loop systems – Control system Terminology – Applications.

Unit II – Modelling of Physical Systems

Transfer function – Modelling of Electric systems, Translational and rotational mechanical systems, Electrical analogous systems. Block diagram reduction, signal flow graphs, multivariable control system.

Unit III – Time Domain Response

Transient and Steady state response - Standard test inputs - Time response of first and second order systems - Time domain specifications. Effect of moving the pole in the s- plane, Effect of adding real pole and zero. Steady state error, error constants and system type.

Unit IV – Stability Analysis

Concept of stability, characteristic equation, location of poles. Routh Hurwitz stability criterion - Root locus technique.

Unit V – Frequency Domain Response

Frequency response: Frequency response of standard second order system - Frequency domain specifications - Relationship between Frequency and time domain specifications – Plots: Bode and Polar - Nyquist stability criterion.

Unit VI – Controller and Compensator Design

Controllers: P, PI, PD, PID - Analytical design of controllers. Compensators: needs and its types - Design of lag, lead, lag-lead compensators using root locus and bode plot.

Unit VII – State Space Representation

Concept of state, state variable and state model. Conversion: Transfer function from state equation, State equation to Transfer function. Solutions of state equations, Controllability and Observability.

Course Outcomes (COs)

• CO1: Define and Explain fundamental concepts of control systems and model physical systems using transfer functions, block diagrams, and signal flow graphs.
• CO2: Apply the concepts of time domain response, steady-state error, and system performance using standard test signals and specifications.
• CO3: Analyze system stability using Routh-Hurwitz criterion, root locus, and frequency domain techniques like Bode and Nyquist plots.
• CO4: Design controllers and compensators and apply state-space techniques for modern control system analysis and design.

Assessment Pattern (Quick Note)

• Weightage: Continuous Assessment 40% | End Semester Examinations 60%
• Internal methodology: Assignment (20%), Software activity (20%), Quiz (20%), Internal Examinations (40%). Suggested Activities: Competitive Problem-Solving (GATE & Beyond), Hands-On Simulation & Hardware, Collaborative Assignments & Research & Modern Trends

Source: Official Anna University – B.E. Electronics and Communication Engineering R-2025 Syllabus
Last Updated: October 2026