What is Bode: Definition and 103 Discussions

Below are a couple of problems given, 3 and 4. They are about drawing bode plots based on a given transfer function. I am wondering if anybody could please let me know if I drew the Bode plots right or wrong? Also I am not sure about how to find the crossover frequency. On task 3 I calculated it...

Can anyone tell me how to find the gain bandwidth product from bode plot of a unity gain circuit for the attached bode plot? I hv attached the circuit and bode plot ...

I'm stuck on a really simple problem because I haven't done MATLAB in a while. I have transfer functions for nth order lowpass Butterworth Filters: H(jw) = 1/(s + w_c)^n I want to plot the 1st to 5th order filters. How do I input H(jw) into matlab? The tf(num, den) is not efficient in that...

Homework Statement http://img832.imageshack.us/img832/7517/captureax.jpg According to the solution, the cutoff frequencies are 1, 20, 80, 500 and 8000. I don't understand how to get those answers by inspecting the plot. Homework Equations None The Attempt at a Solution I think the...

Homework Statement What is the transfer function described by this bode plot: http://img96.imageshack.us/img96/4775/capturegib.jpg *The answer is 3s, but I don't know where it comes from. Homework Equations None The Attempt at a Solution Correct me if I am wrong. A bode plot is a...

For a transfer function of G(s) = 100 / (s(s+5)), I'm having trouble finding the initial magnitude in dB. It's a type 1 system. If it was a type 0 system with only (s+5) in the denominator, the initial magnitude would be 20log(nominator/denominator) where s is an element of 0, and would decrease...

Homework Statement I have the transfer function: for the circuit: The component values are know, and are: R1 = 47kΩ R2 = 4K7Ω C = 10nF Homework Equations The Attempt at a Solution I have derivied the transfer function but have become stuck on plotting the bode plot. I understand...

What is the difference between second order zero bode plot and second order pole bode plot?

Hi there, I'm having a hard time trying to plot a Bode Diagram here in MatLab. The transfer function not only has an exponential function in it, but also has 3 unknowns to which I am not supposed to assign value, and on top of that it is a complex number. Let me write it down to you...

Hi all, on a current homework I have been given a transfer function and asked to draw the straight-line (asymptotic) magnitude (dB) and phase (degrees) Bode plot. I first learned Bode plots roughly a year ago, and while being on spring break and my notebook from last year is at school, I'm...

Homework Statement I have a bode plot with a positive phase. Homework Equations this is a MATLAB code for the thing % bode phase plot w = logspace(1, 4, 100); G = 100*(1+0.017i*w)./(1i.*w.*(1+0.05i.*w).*(1+0.0025i.*w).*(1+0.001i.*w)); fi = atand(imag(G)./real(G)); semilogx(w, fi); % x-axis...

I am learning to draw Bode Plots. I am able to figure out ωgc, ωpc, Phase Margin & Gain Margin graphically from the Bode Plot. But I was wondering if there is a way to calculate ωgc and ωpc mathematically with some formulas - how do I do this?

Since the deci in decibels means 10, why is decibels of Magnitude in the Bode plot calculated as 20log instead of 10log?

Hi, I have a 8th order s-domain transfer function that i would like to normalize for plotting a bode plot. The transfer function is in expanded form i.e. s^8 +s^7+s^6 etc. i want to normalise the frequency f by frequency f0 such that s = j(f/f0) instead of just s = j2πf. the reason i...

Homework Statement I am constructing a Bode plot from a given transfer function. I having trouble because I am unsure how to rewrite the transfer function in the proper form. What makes this transfer function particularly tricky for me, is that there is no "jω" in the numerator, just ω^2...

Hello guys! I have an issue, I'm trying to make a program in which you can get a bode plot by knowing the transfer function in guide. The basic idea is this: you enter 4 numbers in the interface and by those numbers you can know the transfer function, basically I'm doing this as a final step...

How would you plot the magnitude and phase Bode plots for the system transfer function of (4s^3+40s^2)/(4s^4+405s^3+504s^2+400s) I plugged it into MATLAB and got a result but my professor wants hand calculations. Thanks

Homework Statement Question attached Homework Equations Frequency response of circuit given in document The Attempt at a Solution The question leads me to find the Gain and phase of the gain, pole and zero terms. The breakpoint frequency and the point where the gain term is 0db...

I have been drawing a few bode diagram by hand and i am ask to find the phase and gain margin of the plot. Can someone please explain what are phase and gain margin, including how to determine it from the bode plot?

I am trying to manually make a bode plot for the transfer function: G(jw)= 5/[jw(1+jw0.6)(1+jw0.1)] I know how to plot it but I am having a problem determining all the break off frequencies. In particular for the term pole at (1+jw0.6). Could someone give...

I need to draw a frequency- magnitude (bode) plot of this circuit: Firstly I need to find the RC but I don't have a clue. It's meant to be 1ms, and I guess that's from 10k * 100nF BUT why is the 20K not involved? Thanks Thomas

So I understand what these inputs are, however I'm having a hard time visualising what they do in a physical system. Can anyone share any physical examples of what each of these do? E.G I assume a step input in a Mass Spring Damper system would create the force to cause oscillation?

Homework Statement I'm working on a Lab for my Electronics Course and need to use MATLAB to create a Bode Plot to get the data for my theoretical Magnitudes at frequencies between 50Hz and 500 Hz. The Resistor has a value of 1k and the Capacitor has a value of 1uF. I need one for both a high...

Homework Statement What are the effects of poles and zeros of a transfer function on its magnitude graph. Note: The Transfer function is discrete. Homework Equations zeros= roots of numerator poles=roots of denominator The Attempt at a Solution I really don't have any idea. I...

Homework Statement I am really struggling to understand how to draw a phase plot for circuits such as low/high-pass filters and other LCR circuits. I understand how to find the gain and use this information to make a Bode plot but when it comes to phase I just don't even know where to begin...

Dear all, Can anyone describe as to how we can plot frequency response in SIMULINK-MATLAB. One way is to use spectrum analyzer but it does not give accurate results for continuous time systems...another way could off course be to use commands but I need something which can compute bode plots...

1. For the control system described by the transfer function H(s)=Y(s)/U(s)=10/(s^2+11s+10) Sketch the bode plot: amplitude and phase diagram. What is the bandwidth of the system? 2. General form of a second order system H(s)=wn^2/(s^2+2*zeta*wn*s+wn^2) Magnitude characteristic in...

Homework Statement I'm doing a question that requires a Bode plot (magnitude and phase). The Attempt at a Solution I got a transfer function of H(\omega)=\frac{1+\frac{j*\omega}{3}}{1-0.1667(\omega)^{2}+0.4167j*\omega} So there is a simple zero at 3 rad/s; complex pole at 2.45 rad/s...

Homework Statement Find analytical expressions for the magnitude and phase of the frequency response for each G(s) below: (a) G(s)\,=\,\frac{20}{s\,\left(s\,+\,5\right)\left(s\,+\,5\right)}(b) G(s)\,=\,\frac{2\,\left(s\,+\,5\right)}{\left(s\,+\,1\right)\,\left(s\,+\,10\right)}(c)...

Bode Plot problem (Please check my work :)) Homework Statement This is actually a circuits question. It required to find Vo(s) in a network with Vi(t) being 1V (so Vi(s) was 1/s). It then asked to plot the magnitude of Vo for a range of frequencies (from 100 to 1000Hz). The Attempt at a...

Homework Statement Transfer function: G(s) =\frac{k}{s^{2}+2\varsigma\omega_{n}s+\omega_{n}^{2}} a) if u(t) = cos(2t), find the steady state response b) determine the values for k, damping ratio (\varsigma), and the natural frequency. Homework Equations The Attempt at a Solution...

Hi everybody, I did a few measurements at a printer. I have a signal that i put in the printer that gives the printerhead a speed. I have put a sinus on the printerhead, and did this at different frequencies with the same signal strength (20 to 500 Hz, with steps of 15 Hz). I want to...

Hey, could some one please help me with bode plots. I have a transfer function,lets say G(s)=0.16s/(1+0.16s) if I want to find the gain at 10 rads/s, do I subsitute s for 10 and then take 20log( G(10) )? Thats what I thought the method was, but now in my notes it says, Gain = 0.16ω/√(1...

Homework Statement How do you draw a bode plot? I have a simple equation: H(S)=s+10 but no school book. Can you help me understand?

Homework Statement How do you draw a bode plot? I have a simple equation: H(S)=s+10 but no school book. Can you teach me?

I have a task to draw a bode and nyquist diagrams from an expirmential results by using MATLAB, I have the phase delay and the votage gain data (10 results for each), can you help me how to darw bode and nyquist diagrams in MATLAB and which command I can use? thanks

Hi I have a task to draw a bode and nyquist diagrams from an expirmential results, I have the phase delay and the votage gain data, can you help me to darw bode and nyquist diagrams? Thanks

Hi I want your help to understand the comparative merits of Nyqist and Bode diagrams, if you can explain that merits to me? Thanks

Hey guys. I need to know how to draw a Phase Bode plot of a Second order system. I understand and can draw the Gain(Magnitude) Bode plot, but I can't seem to get the grip of the Phase one. As far as I know there is an asymptote at 0^{o} at low frequencies and an asymptote at 180^{o} at...

Hi While going through http://eprints.iisc.ernet.in/archive/00013500/01/lec_6_web.pdf, I came across the following two statements (on page 3), for a system with loop gain = G(s)H(s): 1. Open GH loop must be stable for designing via Bode Plots. 2. If for GH, gain crossover < phase...

Well, it has been awhile... and I need to remember how to draw a Bode phase plot quickly. The problem I am having is, how do I deal with real poles and zeros in the right half plane? I can quickly draw bode phase plots for transfer functions like: H(s) =...

Homework Statement Sketch the Bode Plot for the following Transfer Function: G(s)=10/s(1+ts) where t=0.1sec The Attempt at a Solution G(jw)=10/jw(1+tjw) - frequency response... Gain = 20log(10) - 20log(tw^2+w) Does this mean that the Gain apporaches infinity as w approaches...

Any good online pdf files or websites with examples on how to draw bode plots?

hi, how can i plot the bode plot for this transfer function: 100 ---------------- s^2 + 10s + 100 i have 2*ksi*w=10 w=sqrt(100)=10 thus, ksi=1/2 -ksi*w=-10/2=-5 so the overshoot will be at ksi which is at 1/2 and my magnitude is 1. i don't see how i can find my...

Homework Statement I have to plot some data for a lab writeup. It's based on the frequency response of fluid catheter-transducer systems. Part of this writeup includes making Bode plots for the gain and phase shift. I know how to plot my data; the problem that I am having is that I want to try...

Homework Statement The question asks the reader to make a Bode plot for the following equation: H(\omega)\,=\,\frac{50\left(j\omega\,+\,1\right)}{j\omega\left(-\omega^2\,+\,10j\omega\,+\,25\right)} Homework Equations j\omega\,=\,s The Attempt at a Solution...

Homework Statement sketch a bode plot of frequency versus voltage gain (in decibels) for the following circuit: Homework Equations Voltage divider: V_X = V_S \frac{Z_X}{Z_T} Voltage gain: A_V = \frac{V_O}{V_I} log(A)+log(B) = log(A*B) The Attempt at a Solution This is the most...

Hi, I try to visualize a sine wave, z-transformed in a Bode plot. The frequency shows up correctly, but the amplitude is way off - why? Thanks for your comments. Bmalp function zdemo format compact syms w Ts n z phi t Ts = 1 w = 0.1 phi = 0 vz =...

My notes from lecture are somewhat deceiving. I have this table that is supposed to make plotting the phase portion of a Bode plot simple. I understand the magnitude portion, however I do not get what is being said for the phase portion. I am spending too much time on something that is supposed...

Is the x-axis of a Bode plot supposed to be angular frequency omega or just the frequency f? The y-axis is in dB. Thanks!