Questions tagged [pole-zeroplot]
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30
questions
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35 views
Questions on Bode Plot and Nyquist Plot
Bode Plot
1) Why the gain plot |G(jw)| drops and then increases for conjugate zeroes ?
2) Why the gain plot |G(jw)| increases and then drops for conjugate poles ?
Nyqust Plot
3) For Figure 9-18(B),...
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17 views
spike in the Full bridge SMPS
I have a full bridge SMPS and I am measuring the voltage across the output´s diodes on the secondary side.
As you can see the voltage spike changes by changing the output current, for example at zero ...
0
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1answer
33 views
Stability Criteria of Type 3 Digital PLL
I suppose we can derive the stability criteria based on poles of open-loop transfer function of F(z) in expression (4.11). However, the pole analysis does not help in deriving the stability criteria ...
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2answers
227 views
Low Pass Filter Wrong Pole Location
I wanted to understand and derive an equation of simple low pass filter that shows the location of pole in frequency response graph (Bode plot).
So, here is the derivation:
$$V_{OUT}=\frac{V_{IN}*...
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1answer
53 views
Low Entropy derivation of Transfer Functions with OP AMPS
I was recently low entropy equations of passive filters, and came across the Extra Element Theorem and all of its uses.
I was wondering if the there is something similar for OP AMP circuits/ Active ...
0
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1answer
242 views
Root locus for an open loop transfer function?
The function, rlocus(), in MATLAB is used for closed loop system roots for variation in gain K. However, I am curious if there is a similar function for variation ...
1
vote
2answers
116 views
Meaning of the “pole” of a transfer function with time delay
I learned in basic control theory that we can determine the stability of an LTI system by the signs of the real part of the poles of its transfer function \$H(s)=\frac{N(s)}{D(s)}\$. For a rational ...
0
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2answers
206 views
Poles and Zeros of Two Pole Compensation
I am known with the basics of what poles and zeros of transfer function are and how to determine them, but I certainly don't know how to apply such poles and zeros to the gain curve, which describes ...
0
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3answers
106 views
No zeros, yet still affecting stability?
As far as im aware Poles affect the stability of a transfer function primarily, and is defined whether they stay within the unit circuit & are on the left side of the pole-zero plot. Zeros have no ...
0
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1answer
45 views
Experiment to identify of all the poles from the input output data irrespective of pole zero cancellation?
The pole zero cancellation reduces the order of the system. As a result we can't identify all the poles from the input output data. Given, input output data, can I devise an experiment such that I can ...
0
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2answers
640 views
The Pole Frequency of OP AMP 741
I am working on MatLab simulation software to plot a Bode plot in the Matlab Environment. The open loop transfer function is $$a(s) = \frac{a_0}{(1+s/\omega_1)(1+s/\omega_2)}$$
Where \$\omega_1\$ and ...
0
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1answer
232 views
RHP zero with a positive phase shift
All books and references I read say that RHP zero gives a negative phase shift.
I can infer that by plot the phase of the function \$w_{z}-s\$ where \$w_{z}>0\$.
With this function, when frequency ...
0
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1answer
59 views
How to find the frequency of more than one zeroes analytically?
Hello, I have to draw the Bode plot of \$G(s)=\frac{V_u}{V_{in}}\$ and I want to do it without calculating the full transfer function.
This circuit has Cgd=1pF capacitors at every Mos.
Vt=0.4V, k=2mA/...
0
votes
2answers
670 views
Polar plot of s/(1+(s*T))
The magnitude at w=0 comes out to be 0 (=1/infinity) , which is different from previous problems (they didn't have any zero) I've calculated, is this right? I guess it should be right (because G(s)...
0
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4answers
3k views
What is the difference between the forward transfer function and closed-loop transfer function?
We can define the forward transfer function as
$$l(s)=g(s)r(s)$$
Thus, the closed-loop transfer function is
$$h(s)=\frac{g(s)r(s)}{1+g(s)r(s)}$$
with \$g(s)r(s)\$ the multiplication between all the ...
0
votes
2answers
612 views
Conjugate, non-conjugate and single poles in an RLC circuit system
In all the texts I encountered so far, I find the following pole-zero diagram example for an RLC series circuit:
The transfer function for the above circuit can be found as:
H(s) = XC/(R + XL + XC) =...
0
votes
1answer
251 views
A question on the response of an RC circuit and pole of its transfer function
Below is an excerpt from an introductory level book about poles and zeros:
The transfer function of the RC circuit system above for the output voltage is:
H(s) = s/(s+10)
The book claims that this ...
2
votes
2answers
5k views
What exactly is Pole Frequency in a Filter and how does it affect the frequency response?
I'm having great trouble understanding the concept of a pole in a real world electric circuit. I do understand what a 'pole' is and what a 'zero' is, in the point of view of a 'Transfer Function' but ...
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3answers
403 views
What happens to an electrical system at its pole?
Pole is defined as the value at which value of a function becomes infinity.
Let's say I have one LTI system with transfer function H(s)=1/s+1.
How the system will behave when s=-1.
From Bode plot ...
2
votes
2answers
958 views
Finding desired closed-loop poles from root locus
I am trying to design a P controller (proportional constant only) to satisfy certain overshoot and settling time requirements for my plant. My values for \$\zeta\$ and \$w_n\$ which would satisfy the ...
0
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1answer
794 views
Intuitive to get pole and zero points for lead compensator
The circuit below is a lead compensator. I can easily know exact the pole and zero of the network by deriving the transfer function. However, I am wondering if there is an intuitive method to get the ...
4
votes
3answers
3k views
Finding Transfer Function, Poles, Zeros of an RC Circuit
I'm trying to brush up on some electronics theory and am working through this PDF.
At the bottom of page F-6 there is a problem, F.1, that I am currently trying to solve. The circuit is as follows:
...
0
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1answer
807 views
How are poles of Bessel filter related to cutoff frequency?
For a 2nd order Bessel low pass, I have a pole-zero map which has a pole couple of the form: \$p_{1/2} = a \pm jb\$.
Can I deduce the cutoff frequency from the pole location? Does it contain any ...
0
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2answers
134 views
How do you determine the approximate frequency where the magnitude starts decreasing -40dB/dec for complex pole?
I am stuck at drawing the approximate Bode plot for the complex pole transfer function as below.
Please see the question and problem in the picture.
How do you determine the approximate frequency ...
1
vote
1answer
314 views
Bode diagram of a single complex pole and under-damped system
I would like to draw Bode plot for a complex pole as below. Let's assume that for now regardless that the single complex pole doesn't exist.
This is the function:
$$H = \frac{1}{s - (a + jb)}$$ where ...
0
votes
3answers
651 views
How is the impulse response related to pole/zero-plot?
I have trouble understanding how you can from a pole/zero-plot say something about the impulse response. For instance I have 2 poles in
(-5 +/- 8 jw)
and a zero in 0.
How would I know, from just ...
1
vote
2answers
460 views
poles and zeroes, why the magnitude plot contradicts the actual definition
I know that poles are the frequencies at which the response goes to infinity and zeroes are the frequencies at which the response goes to zero but when we draw the bode plot or magnitude plot the ...
7
votes
4answers
6k views
Meaning of zeros in transfer function
Can someone please explain, provide a link or cite a book where the properties of the zeros for continuous and discrete time systems are explained? I know that the zeros are the frequencies where the ...
1
vote
1answer
387 views
Confused about the shape of 3D s-domain plots
Why in these type of 3D plots does the gain value (z axis) come back down from infinity for sigma values that are greater than the sigma value of a pole?
I thought that these plots are the value of ...
0
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2answers
5k views
Type of Filter from pole-zero plot
If the zeros were on the imaginary axis, it sure would have been a NOTCH filter.
But, since the complex conjugate zeros are on the left of the jW axis,
the transfer function has second order terms ...
