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ECE FORMULA BOOK 2. CONTROL SYSTEMS [42]
Published by: ENGINEERS INSTITUTE OF INDIA.? ALL RIGHTS RESERVED www.engineersinstitute.com
1. BLOCK DIAGRAM
Open Loop Control System:
? In this system the output is not fedback for comparison with the input.
? Open loop system faithfulness depends upon the accuracy of input calibration.
When a designer designs, he simply design open loop system.
Closed Loop Control System: It is also termed as feedback control system. Here
the output has an effect on control action through a feedback. Ex. Human being
Transfer Function:
C(s) G(s)
Transfer function =
R(s) 1 + G(s)H(s)
? Comparison of Open Loop and Closed Loop control systems:
Open Loop:
1. Accuracy of an open loop system is defined by the calibration of input.
2. Open loop system is simple to construct and cheap.
3. Open loop systems are generally stable.
4. Operation of this system is affected due to presence of non-linearity in its
elements.
Closed Loop:
1. As the error between the reference input and the output is continuously
measured through feedback. The closed system works more accurately.
2. Closed loop systems is complicated to construct and it is costly.
3. It becomes unstable under certain conditions.
4. In terms of performance the closed loop system adjusts to the effects of non-
linearity present.
Transfer Function: The transfer function of an LTI system may be defined as the
ratio of Laplace transform of output to Laplace transform of input under the
assumption
Y(s)
G(s)=
X(s)
? The transfer function is completely specified in terms of its poles and zeros and
the gain factor.
C o n t r o l
 
S y s t e m
Page 2


ECE FORMULA BOOK 2. CONTROL SYSTEMS [42]
Published by: ENGINEERS INSTITUTE OF INDIA.? ALL RIGHTS RESERVED www.engineersinstitute.com
1. BLOCK DIAGRAM
Open Loop Control System:
? In this system the output is not fedback for comparison with the input.
? Open loop system faithfulness depends upon the accuracy of input calibration.
When a designer designs, he simply design open loop system.
Closed Loop Control System: It is also termed as feedback control system. Here
the output has an effect on control action through a feedback. Ex. Human being
Transfer Function:
C(s) G(s)
Transfer function =
R(s) 1 + G(s)H(s)
? Comparison of Open Loop and Closed Loop control systems:
Open Loop:
1. Accuracy of an open loop system is defined by the calibration of input.
2. Open loop system is simple to construct and cheap.
3. Open loop systems are generally stable.
4. Operation of this system is affected due to presence of non-linearity in its
elements.
Closed Loop:
1. As the error between the reference input and the output is continuously
measured through feedback. The closed system works more accurately.
2. Closed loop systems is complicated to construct and it is costly.
3. It becomes unstable under certain conditions.
4. In terms of performance the closed loop system adjusts to the effects of non-
linearity present.
Transfer Function: The transfer function of an LTI system may be defined as the
ratio of Laplace transform of output to Laplace transform of input under the
assumption
Y(s)
G(s)=
X(s)
? The transfer function is completely specified in terms of its poles and zeros and
the gain factor.
C o n t r o l
 
S y s t e m
ECE FORMULA BOOK 2. CONTROL SYSTEMS [43]
Published by: ENGINEERS INSTITUTE OF INDIA.? ALL RIGHTS RESERVED www.engineersinstitute.com
? The T.F. function of a system depends on its elements, assuming initial
conditions as zero and is independent of the input function.
? To find a gain of system through transfer function put s = 0
Example: G(s) = Gain =
If a step, ramp or parabolic response of T.F. is given, then we can find Impulse
Response directly through differentiation of that T.F.
(Parabolic Response) = Ramp Response
(Ramp Response) = Step Response
(Step Response) = Impulse Response
Block Diagram Reduction:
Rule Original Diagram Equivalent Diagram
1. Combining
blocks in cascade
2. Moving a
summing point
after a block
3. Moving a
summing point
ahead of block
4. Moving a take
off point after a
block
2
4
6 9
s
s s
? ? ? 4
9
d
dt
d
dt
d
dt
G
1
X
1
G
2
X G
1 1
X G G
2 1 1
X
1
G G
2 1
X G G
2 1 1
G
X
1
X
1
X G
1
G
X
1
X
1
1/G
X G
1
Read More
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FAQs on Short Notes: Control System - Short Notes for Electronics and Communication - Electronics and Communication Engineering (ECE)

1. What is a control system in Electronics and Communication Engineering?
Ans. A control system is a system that manages, commands, directs, or regulates the behavior of other devices or systems. In Electronics and Communication Engineering, control systems are used to regulate the behavior of electronic devices or communication systems.
2. What are the types of control systems used in Electronics and Communication Engineering?
Ans. The types of control systems used in Electronics and Communication Engineering include open-loop control systems, closed-loop control systems, linear control systems, non-linear control systems, and digital control systems.
3. How are control systems implemented in electronic devices?
Ans. Control systems in electronic devices are implemented using components such as sensors, actuators, controllers, and feedback mechanisms. These components work together to regulate and control the behavior of the electronic device.
4. What are the applications of control systems in Electronics and Communication Engineering?
Ans. Control systems are used in various applications in Electronics and Communication Engineering, such as in robotics, automated systems, signal processing, power systems, and communication networks.
5. How do control systems contribute to the field of Electronics and Communication Engineering?
Ans. Control systems play a crucial role in Electronics and Communication Engineering by ensuring the stability, performance, and reliability of electronic devices and communication systems. They help in maintaining the desired output and regulating the behavior of the systems.
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