# Questions tagged [bode-plot]

Anything related to Bode plots, i.e. a special graphical representation of the frequency response of a linear time-invariant system.

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### LTspice Bode plot is incorrect or inconsistent (op-amp circuit)

I'm testing the open loop transfer function of an op-amp circuit by following this schematic: This is my LTspice schematic (keep in mind the actual op-amp circuit itself has been thoroughly checked, ...
17 views

### Error during analysis in AWR Microwave Office

How to fix this error, and what does it mean? A port is off grid. All polygon edges with ports attached must be 'snapped' to the grid.
79 views

### Bode plot of second-order system

I was reading about second-order systems in Control systems engineering by Norman Nise and I am confused by the idea that the phase at high frequencies of a second-order system is equal to 180° (check ...
99 views

### Why do we talk about system stability as a whole when Barkhausen criteria is valid only for one specific frequency?

The relationship AB=1 will be applicable only at a specific frequency. For instance, following is the bode plot for a circuit I have and as can be seen, the barkhausen criterion is met only at 6.3MEG ...
85 views

### Frequency response of LC filter with resistance in parallel with the capacitor

The following is the diagram of interest: The impedance of the filter is: $$Z_o=\frac{R_f L_f s}{R_f L_f C_f s^2+L_f s+R_f}$$ and the bode plot with all different components and the total impedance ...
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### Phase response in MATLAB simulation doesn't match the book

I am trying to replicate a result from a textbook that I am using to study input filter design for buck converters. The parameters for the converter and filter are as follows: D = 0.5 L = 100 μH C = ...
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### Reading transfer function values from Bode plot

I am trying to get back into control systems and at the moment I am stuck on how to extract the damping ratio and gain from the Bode plot I generated. Firstly the gain. As far as I can remember the ...
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1 vote
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### Meaning behind DC/DC converter frequency response

I am currently reading an article about control methods of DC-DC converters which contains the following diagram: This diagram seems to show the magnitude (gain) and phase of the output signal of the ...
77 views

### LTI system Bode curve

Given an RLC circuit, I needed to find the transfer function, which I did. Now I need to find R and L so that the next two conditions are met: The overshoot is 25% The first peak time is t = 3 The ...
1 vote
60 views

### Optimum design of damping LC filter with parallel (R+C). There is a frequency in which value of R dosn't impact

Apologies for the not so clear title, but I don't know if there is a common phrase that describes the point of concern. I am taking an online course about input filter design interfacing the grid and ...
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95 views

### Why do LC filters have 40 dB/decade ripple attenuation at high frequencies?

I am taking an online course on power electronics in which I encountered the following concept which I couldn't understand. The instructor had the following comment about the following grid interface ...
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146 views

### How to determine the phase margin when the Bode plot never crosses 0 dB?

I have a graph that looks like this. I am tasked to measure the phase margin, but the graph doesn't exceed 0 dB. The circuit is this. The input DC level is 0.6 V, which is the problem. When I change ...
119 views

### Why can the Bode plots of transfer functions have negative magnitude values?

I am currently learning about Bode plots and transfer functions. I am confused about what information the "magnitude" values of the transfer function are supposed to contain. I am mainly ...
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56 views

### Confusion regarding bode plot?

I am trying to understand bode plot and i came across attached snap especially black solid line in magnitude plot, i captured this snap from wikipedia. Here i am confused,what is cutt off frequency? ...
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### How to design filters with transfer function?

I want to design filters base on transfer function and Bode plots. For example, lets say I want a low pass filter, the limit is 36hz. How should I design a transfer function base on 36 hz limit? (pls ...
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### How to recognize a non-minimum phase system from the Bode plot?

I have a bode diagram and I have to obtain if is it a non-minimum phase system or not. I think we could obtain zeros and poles from the Bode diagram but I'm looking for a fast way to find the answer. ...