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Page 1
Introduction to Bode Plot
• 2 plots – both have logarithm of frequency on x -axis
o y-axis magnitude of transfer function, H(s), in dB
o y-axis phase angle
The plot can be used to interpret how the input affects the output in both magnitude and phase over
frequency.
Where do the Bode diagram lines comes from?
1) Determine the Transfer Function of the system:
) (
) (
) (
1
1
p s s
z s K
s H
+
+
=
2) Rewrite it by factoring both the numerator and denominator into the standard form
) 1 (
) 1 (
) (
1
1
1
1
+
+
=
p
s
sp
z
s
Kz
s H
where the z s are called zeros and the p
s are called poles.
3) Replace s with j? . Then find the Magnitude of the Transfer Function.
) 1 (
) 1 (
) (
1
1
1
1
+
+
=
p
jw
jwp
z
jw
Kz
jw H
If we take the log
10
of this magnitude and multiply it by 20 it takes on the form of
20 log
10
(H(jw)) =
?
?
?
?
?
?
?
?
?
?
+
+
) 1 (
) 1 (
log 20
1
1
1
1
10
p
jw
jwp
z
jw
Kz
=
) 1 ( log 20 log 20 log 20 ) 1 ( log 20 log 20 log 20
1
10 10 1 10
1
10 1 10 10
+ - - - + + +
z
jw
jw p
z
jw
z K
Each of these individual terms is very easy to show on a logarithmic plot. The entire Bode log magnitude plot is
the result of the superposition of all the straight line terms. This means with a little practice, we can quickly sketch
the effect of each term and quickly find the overall effect. To do this we have to understand the effect of the
different types of terms.
These include: 1) Constant terms K
2) Poles and Zeros at the origin | j? |
3) Poles and Zeros not at the origin
1
1
p
j w
+ or
1
1
z
j w
+
4) Complex Poles and Zeros (addressed later)
Page 2
Introduction to Bode Plot
• 2 plots – both have logarithm of frequency on x -axis
o y-axis magnitude of transfer function, H(s), in dB
o y-axis phase angle
The plot can be used to interpret how the input affects the output in both magnitude and phase over
frequency.
Where do the Bode diagram lines comes from?
1) Determine the Transfer Function of the system:
) (
) (
) (
1
1
p s s
z s K
s H
+
+
=
2) Rewrite it by factoring both the numerator and denominator into the standard form
) 1 (
) 1 (
) (
1
1
1
1
+
+
=
p
s
sp
z
s
Kz
s H
where the z s are called zeros and the p
s are called poles.
3) Replace s with j? . Then find the Magnitude of the Transfer Function.
) 1 (
) 1 (
) (
1
1
1
1
+
+
=
p
jw
jwp
z
jw
Kz
jw H
If we take the log
10
of this magnitude and multiply it by 20 it takes on the form of
20 log
10
(H(jw)) =
?
?
?
?
?
?
?
?
?
?
+
+
) 1 (
) 1 (
log 20
1
1
1
1
10
p
jw
jwp
z
jw
Kz
=
) 1 ( log 20 log 20 log 20 ) 1 ( log 20 log 20 log 20
1
10 10 1 10
1
10 1 10 10
+ - - - + + +
z
jw
jw p
z
jw
z K
Each of these individual terms is very easy to show on a logarithmic plot. The entire Bode log magnitude plot is
the result of the superposition of all the straight line terms. This means with a little practice, we can quickly sketch
the effect of each term and quickly find the overall effect. To do this we have to understand the effect of the
different types of terms.
These include: 1) Constant terms K
2) Poles and Zeros at the origin | j? |
3) Poles and Zeros not at the origin
1
1
p
j w
+ or
1
1
z
j w
+
4) Complex Poles and Zeros (addressed later)
Effect of Constant Terms:
Constant terms such as K contribute a straight horizontal line of magnitude 20 log
10
(K)
H = K
Effect of Individual Zeros and Poles at the origin:
A zero at the origin occurs when there is an s or j? multiplying the numerator. Each occurrence of this
causes a positively sloped line passing through ? = 1 with a rise of 20 db over a decade.
H = | w j |
A pole at the origin occurs when there are s or j? multiplying the denominator. Each occurrence of this
causes a negatively sloped line passing through ? = 1 with a drop of 20 db over a decade.
H =
w j
1
Effect of Individual Zeros and Poles Not at the Origin
Zeros and Poles not at the origin are indicated by the (1+j? /z
i
) and (1+j? /p
i
). The values
z
i
and p
i
in each of these expression is called a critical frequency (or break frequency). Below their critical
frequency these terms do not contribute to the log magnitude of the overall plot. Above the critical
frequency, they represent a ramp function of 20 db per decade. Zeros give a positive slope. Poles produce a
negative slope.
H =
i
i
p
j
z
j
w
w
+
+
1
1
20 log
10
(K)
?
0.1
1
10 100
(log scale)
20 log
10
(H)
?
0.1
1
10 100
(log
10
scale)
20 log(H)
-20 db
dec.
dec.
+20 db
z
i
p
i
-20 db
?
0.1
1
10 100
(log scale)
20 log(H)
dec
?
0.1
1
10 100
(log scale)
20 log(H)
20 db
dec
Page 3
Introduction to Bode Plot
• 2 plots – both have logarithm of frequency on x -axis
o y-axis magnitude of transfer function, H(s), in dB
o y-axis phase angle
The plot can be used to interpret how the input affects the output in both magnitude and phase over
frequency.
Where do the Bode diagram lines comes from?
1) Determine the Transfer Function of the system:
) (
) (
) (
1
1
p s s
z s K
s H
+
+
=
2) Rewrite it by factoring both the numerator and denominator into the standard form
) 1 (
) 1 (
) (
1
1
1
1
+
+
=
p
s
sp
z
s
Kz
s H
where the z s are called zeros and the p
s are called poles.
3) Replace s with j? . Then find the Magnitude of the Transfer Function.
) 1 (
) 1 (
) (
1
1
1
1
+
+
=
p
jw
jwp
z
jw
Kz
jw H
If we take the log
10
of this magnitude and multiply it by 20 it takes on the form of
20 log
10
(H(jw)) =
?
?
?
?
?
?
?
?
?
?
+
+
) 1 (
) 1 (
log 20
1
1
1
1
10
p
jw
jwp
z
jw
Kz
=
) 1 ( log 20 log 20 log 20 ) 1 ( log 20 log 20 log 20
1
10 10 1 10
1
10 1 10 10
+ - - - + + +
z
jw
jw p
z
jw
z K
Each of these individual terms is very easy to show on a logarithmic plot. The entire Bode log magnitude plot is
the result of the superposition of all the straight line terms. This means with a little practice, we can quickly sketch
the effect of each term and quickly find the overall effect. To do this we have to understand the effect of the
different types of terms.
These include: 1) Constant terms K
2) Poles and Zeros at the origin | j? |
3) Poles and Zeros not at the origin
1
1
p
j w
+ or
1
1
z
j w
+
4) Complex Poles and Zeros (addressed later)
Effect of Constant Terms:
Constant terms such as K contribute a straight horizontal line of magnitude 20 log
10
(K)
H = K
Effect of Individual Zeros and Poles at the origin:
A zero at the origin occurs when there is an s or j? multiplying the numerator. Each occurrence of this
causes a positively sloped line passing through ? = 1 with a rise of 20 db over a decade.
H = | w j |
A pole at the origin occurs when there are s or j? multiplying the denominator. Each occurrence of this
causes a negatively sloped line passing through ? = 1 with a drop of 20 db over a decade.
H =
w j
1
Effect of Individual Zeros and Poles Not at the Origin
Zeros and Poles not at the origin are indicated by the (1+j? /z
i
) and (1+j? /p
i
). The values
z
i
and p
i
in each of these expression is called a critical frequency (or break frequency). Below their critical
frequency these terms do not contribute to the log magnitude of the overall plot. Above the critical
frequency, they represent a ramp function of 20 db per decade. Zeros give a positive slope. Poles produce a
negative slope.
H =
i
i
p
j
z
j
w
w
+
+
1
1
20 log
10
(K)
?
0.1
1
10 100
(log scale)
20 log
10
(H)
?
0.1
1
10 100
(log
10
scale)
20 log(H)
-20 db
dec.
dec.
+20 db
z
i
p
i
-20 db
?
0.1
1
10 100
(log scale)
20 log(H)
dec
?
0.1
1
10 100
(log scale)
20 log(H)
20 db
dec
• To complete the log magnitude vs. frequency plot of a Bode diagram, we superposition all the lines
of the different terms on the same plot.
Example 1:
For the transfer function given, sketch the Bode log magnitude diagram which shows how the log
magnitude of the system is affected by changing input frequency. (TF=transfer function)
1
2 100
TF
s
=
+
Step 1: Repose the equation in Bode plot form:
1
100
1
50
TF
s
??
??
??
=
+
recognized as
1
1
1
K
TF
s
p
=
+
with K = 0.01 and p
1
= 50
For the constant, K: 20 log
10
(0.01) = -40
For the pole, with critical frequency, p
1
:
Example 2:
Your turn. Find the Bode log magnitude plot for the transfer function,
4
2
5 10
505 2500
xs
TF
ss
=
++
Start by simplifying the transfer function form:
50
-40 db
0db
? (log scale)
20 log
10
(MF)
Page 4
Introduction to Bode Plot
• 2 plots – both have logarithm of frequency on x -axis
o y-axis magnitude of transfer function, H(s), in dB
o y-axis phase angle
The plot can be used to interpret how the input affects the output in both magnitude and phase over
frequency.
Where do the Bode diagram lines comes from?
1) Determine the Transfer Function of the system:
) (
) (
) (
1
1
p s s
z s K
s H
+
+
=
2) Rewrite it by factoring both the numerator and denominator into the standard form
) 1 (
) 1 (
) (
1
1
1
1
+
+
=
p
s
sp
z
s
Kz
s H
where the z s are called zeros and the p
s are called poles.
3) Replace s with j? . Then find the Magnitude of the Transfer Function.
) 1 (
) 1 (
) (
1
1
1
1
+
+
=
p
jw
jwp
z
jw
Kz
jw H
If we take the log
10
of this magnitude and multiply it by 20 it takes on the form of
20 log
10
(H(jw)) =
?
?
?
?
?
?
?
?
?
?
+
+
) 1 (
) 1 (
log 20
1
1
1
1
10
p
jw
jwp
z
jw
Kz
=
) 1 ( log 20 log 20 log 20 ) 1 ( log 20 log 20 log 20
1
10 10 1 10
1
10 1 10 10
+ - - - + + +
z
jw
jw p
z
jw
z K
Each of these individual terms is very easy to show on a logarithmic plot. The entire Bode log magnitude plot is
the result of the superposition of all the straight line terms. This means with a little practice, we can quickly sketch
the effect of each term and quickly find the overall effect. To do this we have to understand the effect of the
different types of terms.
These include: 1) Constant terms K
2) Poles and Zeros at the origin | j? |
3) Poles and Zeros not at the origin
1
1
p
j w
+ or
1
1
z
j w
+
4) Complex Poles and Zeros (addressed later)
Effect of Constant Terms:
Constant terms such as K contribute a straight horizontal line of magnitude 20 log
10
(K)
H = K
Effect of Individual Zeros and Poles at the origin:
A zero at the origin occurs when there is an s or j? multiplying the numerator. Each occurrence of this
causes a positively sloped line passing through ? = 1 with a rise of 20 db over a decade.
H = | w j |
A pole at the origin occurs when there are s or j? multiplying the denominator. Each occurrence of this
causes a negatively sloped line passing through ? = 1 with a drop of 20 db over a decade.
H =
w j
1
Effect of Individual Zeros and Poles Not at the Origin
Zeros and Poles not at the origin are indicated by the (1+j? /z
i
) and (1+j? /p
i
). The values
z
i
and p
i
in each of these expression is called a critical frequency (or break frequency). Below their critical
frequency these terms do not contribute to the log magnitude of the overall plot. Above the critical
frequency, they represent a ramp function of 20 db per decade. Zeros give a positive slope. Poles produce a
negative slope.
H =
i
i
p
j
z
j
w
w
+
+
1
1
20 log
10
(K)
?
0.1
1
10 100
(log scale)
20 log
10
(H)
?
0.1
1
10 100
(log
10
scale)
20 log(H)
-20 db
dec.
dec.
+20 db
z
i
p
i
-20 db
?
0.1
1
10 100
(log scale)
20 log(H)
dec
?
0.1
1
10 100
(log scale)
20 log(H)
20 db
dec
• To complete the log magnitude vs. frequency plot of a Bode diagram, we superposition all the lines
of the different terms on the same plot.
Example 1:
For the transfer function given, sketch the Bode log magnitude diagram which shows how the log
magnitude of the system is affected by changing input frequency. (TF=transfer function)
1
2 100
TF
s
=
+
Step 1: Repose the equation in Bode plot form:
1
100
1
50
TF
s
??
??
??
=
+
recognized as
1
1
1
K
TF
s
p
=
+
with K = 0.01 and p
1
= 50
For the constant, K: 20 log
10
(0.01) = -40
For the pole, with critical frequency, p
1
:
Example 2:
Your turn. Find the Bode log magnitude plot for the transfer function,
4
2
5 10
505 2500
xs
TF
ss
=
++
Start by simplifying the transfer function form:
50
-40 db
0db
? (log scale)
20 log
10
(MF)
Example 2 Solution:
Your turn. Find the Bode log magnitude plot for the transfer function,
4
2
5 10
505 2500
xs
TF
ss
=
++
Simplify transfer function form:
4
4
5 10
5 10 20
5*500
( 5)( 500)
( 1)( 1) ( 1)( 1)
5 500 5 500
x
s
xss
TF
s s ss
ss
===
++
++++
Recognize: K = 20 à 20 log10(20) = 26.02
1 zero at the origin
2 poles: at p
1
= 5 and p
2
=500
Technique to get started:
1) Draw the line of each individual term on the graph
2) Follow the combined pole-zero at the origin line back to the left side of the graph.
3) Add the constant offset, 20 log
10
(K), to the value where the pole/zero at the origin line intersects the left
side of the graph.
4) Apply the effect of the poles/zeros not at the origin. working from left (low values) to right (higher
values) of the poles/zeros.
0 db
-40 db
10
0
80 db
-80 db
40 db
10
3
10
2
10
1
? (log scale)
Page 5
Introduction to Bode Plot
• 2 plots – both have logarithm of frequency on x -axis
o y-axis magnitude of transfer function, H(s), in dB
o y-axis phase angle
The plot can be used to interpret how the input affects the output in both magnitude and phase over
frequency.
Where do the Bode diagram lines comes from?
1) Determine the Transfer Function of the system:
) (
) (
) (
1
1
p s s
z s K
s H
+
+
=
2) Rewrite it by factoring both the numerator and denominator into the standard form
) 1 (
) 1 (
) (
1
1
1
1
+
+
=
p
s
sp
z
s
Kz
s H
where the z s are called zeros and the p
s are called poles.
3) Replace s with j? . Then find the Magnitude of the Transfer Function.
) 1 (
) 1 (
) (
1
1
1
1
+
+
=
p
jw
jwp
z
jw
Kz
jw H
If we take the log
10
of this magnitude and multiply it by 20 it takes on the form of
20 log
10
(H(jw)) =
?
?
?
?
?
?
?
?
?
?
+
+
) 1 (
) 1 (
log 20
1
1
1
1
10
p
jw
jwp
z
jw
Kz
=
) 1 ( log 20 log 20 log 20 ) 1 ( log 20 log 20 log 20
1
10 10 1 10
1
10 1 10 10
+ - - - + + +
z
jw
jw p
z
jw
z K
Each of these individual terms is very easy to show on a logarithmic plot. The entire Bode log magnitude plot is
the result of the superposition of all the straight line terms. This means with a little practice, we can quickly sketch
the effect of each term and quickly find the overall effect. To do this we have to understand the effect of the
different types of terms.
These include: 1) Constant terms K
2) Poles and Zeros at the origin | j? |
3) Poles and Zeros not at the origin
1
1
p
j w
+ or
1
1
z
j w
+
4) Complex Poles and Zeros (addressed later)
Effect of Constant Terms:
Constant terms such as K contribute a straight horizontal line of magnitude 20 log
10
(K)
H = K
Effect of Individual Zeros and Poles at the origin:
A zero at the origin occurs when there is an s or j? multiplying the numerator. Each occurrence of this
causes a positively sloped line passing through ? = 1 with a rise of 20 db over a decade.
H = | w j |
A pole at the origin occurs when there are s or j? multiplying the denominator. Each occurrence of this
causes a negatively sloped line passing through ? = 1 with a drop of 20 db over a decade.
H =
w j
1
Effect of Individual Zeros and Poles Not at the Origin
Zeros and Poles not at the origin are indicated by the (1+j? /z
i
) and (1+j? /p
i
). The values
z
i
and p
i
in each of these expression is called a critical frequency (or break frequency). Below their critical
frequency these terms do not contribute to the log magnitude of the overall plot. Above the critical
frequency, they represent a ramp function of 20 db per decade. Zeros give a positive slope. Poles produce a
negative slope.
H =
i
i
p
j
z
j
w
w
+
+
1
1
20 log
10
(K)
?
0.1
1
10 100
(log scale)
20 log
10
(H)
?
0.1
1
10 100
(log
10
scale)
20 log(H)
-20 db
dec.
dec.
+20 db
z
i
p
i
-20 db
?
0.1
1
10 100
(log scale)
20 log(H)
dec
?
0.1
1
10 100
(log scale)
20 log(H)
20 db
dec
• To complete the log magnitude vs. frequency plot of a Bode diagram, we superposition all the lines
of the different terms on the same plot.
Example 1:
For the transfer function given, sketch the Bode log magnitude diagram which shows how the log
magnitude of the system is affected by changing input frequency. (TF=transfer function)
1
2 100
TF
s
=
+
Step 1: Repose the equation in Bode plot form:
1
100
1
50
TF
s
??
??
??
=
+
recognized as
1
1
1
K
TF
s
p
=
+
with K = 0.01 and p
1
= 50
For the constant, K: 20 log
10
(0.01) = -40
For the pole, with critical frequency, p
1
:
Example 2:
Your turn. Find the Bode log magnitude plot for the transfer function,
4
2
5 10
505 2500
xs
TF
ss
=
++
Start by simplifying the transfer function form:
50
-40 db
0db
? (log scale)
20 log
10
(MF)
Example 2 Solution:
Your turn. Find the Bode log magnitude plot for the transfer function,
4
2
5 10
505 2500
xs
TF
ss
=
++
Simplify transfer function form:
4
4
5 10
5 10 20
5*500
( 5)( 500)
( 1)( 1) ( 1)( 1)
5 500 5 500
x
s
xss
TF
s s ss
ss
===
++
++++
Recognize: K = 20 à 20 log10(20) = 26.02
1 zero at the origin
2 poles: at p
1
= 5 and p
2
=500
Technique to get started:
1) Draw the line of each individual term on the graph
2) Follow the combined pole-zero at the origin line back to the left side of the graph.
3) Add the constant offset, 20 log
10
(K), to the value where the pole/zero at the origin line intersects the left
side of the graph.
4) Apply the effect of the poles/zeros not at the origin. working from left (low values) to right (higher
values) of the poles/zeros.
0 db
-40 db
10
0
80 db
-80 db
40 db
10
3
10
2
10
1
? (log scale)
Example 3: One more time. This one is harder. Find the Bode log magnitude plot for the transfer function,
200( 20)
(2 1)( 40)
s
TF
sss
+
=
++
Simplify transfer function form:
0 db
-40 db
10
0
80 db
-80 db
40 db
10
3
10
2
10
1
20log
10
(TF)
? (log scale)
0 db
-40 db
10
0
80 db
-80 db
40 db
10
3
10
2
10
1
? (log scale)
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The Bode Plot Overview is an invaluable resource that delves deep into the core of the Electrical Engineering (EE) exam.
These study notes are curated by experts and cover all the essential topics and concepts, making your preparation more efficient and effective.
With the help of these notes, you can grasp complex subjects quickly, revise important points easily,
and reinforce your understanding of key concepts. The study notes are presented in a concise and easy-to-understand manner,
allowing you to optimize your learning process. Whether you're looking for best-recommended books, sample papers, study material,
or toppers' notes, this PDF has got you covered. Download the Bode Plot Overview now and kickstart your journey towards success in the Electrical Engineering (EE) exam.
Importance of Bode Plot Overview
The importance of Bode Plot Overview cannot be overstated, especially for Electrical Engineering (EE) aspirants.
This document holds the key to success in the Electrical Engineering (EE) exam.
It offers a detailed understanding of the concept, providing invaluable insights into the topic.
By knowing the concepts well in advance, students can plan their preparation effectively.
Utilize this indispensable guide for a well-rounded preparation and achieve your desired results.
Bode Plot Overview Notes
Bode Plot Overview Notes offer in-depth insights into the specific topic to help you master it with ease.
This comprehensive document covers all aspects related to Bode Plot Overview.
It includes detailed information about the exam syllabus, recommended books, and study materials for a well-rounded preparation.
Practice papers and question papers enable you to assess your progress effectively.
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Access to Toppers' notes gives you an edge in understanding complex concepts.
Whether you're a beginner or aiming for advanced proficiency, Bode Plot Overview Notes on EduRev are your ultimate resource for success.
Bode Plot Overview Electrical Engineering (EE) Questions
The "Bode Plot Overview Electrical Engineering (EE) Questions" guide is a valuable resource for all aspiring students preparing for the
Electrical Engineering (EE) exam. It focuses on providing a wide range of practice questions to help students gauge
their understanding of the exam topics. These questions cover the entire syllabus, ensuring comprehensive preparation.
The guide includes previous years' question papers for students to familiarize themselves with the exam's format and difficulty level.
Additionally, it offers subject-specific question banks, allowing students to focus on weak areas and improve their performance.
Study Bode Plot Overview on the App
Students of Electrical Engineering (EE) can study Bode Plot Overview alongwith tests & analysis from the EduRev app,
which will help them while preparing for their exam. Apart from the Bode Plot Overview,
students can also utilize the EduRev App for other study materials such as previous year question papers, syllabus, important questions, etc.
The EduRev App will make your learning easier as you can access it from anywhere you want.
The content of Bode Plot Overview is prepared as per the latest Electrical Engineering (EE) syllabus.
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