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Are you a GATE Electronics and Communications Engineering aspirant? Then this article is for you. Let’s get high on the GATE preparation for ECE focusing on control systems. Check out the syllabus, important topics and some good references to study this topic.

- Basic control system components
- Feedback principle
- Transfer function
- Block diagram representation
- Signal flow graph
- Transient and steady-state analysis of LTI systems
- Frequency response
- Routh-Hurwitz and Nyquist stability criteria
- Bode and root-locus plots
- Lag, lead and lag-lead compensation
- State variable model and solution of state equation of LTI systems

Now we will move on to look at the important topics that should be well studied in control systems while preparing for GATE.

**Also Read: Preparing to Apply for GATE 2021? Know The Eligibility Criteria for GATE Exam**

Block Diagram reduction technique and equivalent Transfer Functions for both positive and negative feedback are important for GATE preparation for ECE. Signal Flow Graphs and Mason’s Gain Formula’s help simplify problems here.

Time response of 2nd order system, time response specifications and steady-state error are considered important. Formulas for rise-time, maximum overshoot, settling time, peak time and also various error coefficients like position error coefficient, velocity error coefficient and acceleration error coefficient are important.

Routh’s stability criterion and root locus (complimentary root locus) are important topics.

Formulas of resonant frequency, resonant peak and bandwidth should be remembered. Frequency response and bode plots are important.

Gain and phase margin.

Model from transfer function, the transfer function from state model, solution of state equation, controllability observability and stability of a system are important. Transition matrix and its relation with transfer function should be known.

PD controller, Pi controller and PID controller are important.

Lead compensator, Lag compensator and Lead-Lag compensator are important here.

*Automatic Control Systems*by B.C. Kuo*Control System Engg.*by I.G. Nagrath & M.Gopal*Linear Control System*by B.S. Manke

- Make a study strategy and study the topics in sequence. Make notes while studying.
- Give more time to important topics like electronics devices, digital circuits etc.
- While preparing for GATE, solve problems after finishing every topic.
- Understand the strong and weak areas in that topic.
- So, you have ample time, read the concepts of the weak topic again (ask a friend or professor for help if needed). If short on time, first check if the topic that you are weak in is listed in the list of the important topics. If not mark it, and skip it for now. Come back to it later, after you have completed the entire syllabus and are left with time to study that topic.
- Also, repeat the same for all the subjects.
- After finishing all, solve full portion practice tests dedicated for GATE preparation for ECE.
- Furthermore, analyse your results from there. First target the topics that hold high weightage and you are weak at.
- Repeat the previous step till before GATE.

While you may take your time to decide for yourself, have a look at a video on Classical Control Theory by one of the faculty at GATE School. Also, At GATE School students are offered with video lectures, personalised mentor support to every student who enrols for the course and ample of tests.

So, If you are on a time crunch it may be a good idea to consider hiring a personal tutor or joining an online course to help you save time in understanding of concepts and clearing of doubts. Hence, should help you analyse your test result and help you get personalized guidance.

Best of luck with your exam!

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