Frequency response Definition and 99 Threads

Can someone please tell me how I can plot the magnitude and phase response of this transfer function on wolfram alpha as I don't have Matlab: H(s) = -(2.1953*10^12)/(66600*((j*ω)^2)+808823539.4*(j*ω)+2.1626*10^12) A link to the output would be very useful also, thanks heaps.

Hi to everybody, I could really use some help in order to understand how to obtain an impulse response from a frequency response. I am dealing with acoustics, but my knowledge on the particular are basic. I am trying to compare a theory for the scattering of sound from an object with...

Hi all. I'd like to ask you a question. I need to find an equation as to plot the frequency response of an SML photodiode in the MATLAB environment. Can you help me? Thanks in advance for your reply. Regards, Steven

I have a huge difference between what I'm measuring and what I'm calculating, since I can no longer check the circuit (and everyone in the class seems to be having the same problem as me) I'm going to assume it's the calculations. I'm trying to calculate the response of the voltage over a...

I'm working on an analysis problem using Abaqus. I would like to compare my results with an exact equation. My problem is modeled as a simply supported beam with a lumped mass at the end. The equation that I'm using for the exact solution is as follows: k=3EI/L3 ωn=\sqrt{k/(M + 0.23m)} How do...

Homework Statement Find the impulse and frequency responses of the following systems: 1. y(n) = \frac{1}{N+1}\sum_{k=-N}^{N}(1-\frac{|k|}{N+1})x(n-k) 2. y(n)=ay(n-1)+(1-a)x(n), where 0<a<1 Homework Equations The Attempt at a SolutionOk so for 1. I look at h(n) which is...

Homework Statement We did a lab analyzing this inverting, negative feedback circuit for a 741 op-amp: We measured the closed-loop gain and phase shift of the signal for several values of the input frequency with R_2/R1=1000,R_2/R1=100 and R_2/R_1=10. The gain curves all looked like...

I’m interested in audio design and was messing around with NI Multisim building some basic filters. I created a 2nd order low pass filter with capacitors and found that the 2nd stage of the filter impacts the frequency response of 1st filter as illustrated below. This would seem to indicate...

Homework Statement IIR filter with poles at .7±j0.2 and zeros at 0.2±j0.7 Calculate H(f) and the Differance Equation when the DC gain |H(f=0)|=4 The Attempt at a Solution I know to find H(f) I can evaluate H(z) along the unit circle. so H(z) evaluated at z=exp(j2pifT) However...

Im struggling to do the following question. Any help would be appreciated A following system has the following difference equation y(n)+ 1/8y(n-1) - 5/8y(n-2)=1/2x(n-1) First part is to calculate the system transfer function using the z transform. Then get the frequency response and...

I undestand the following concerning the frequency response function; Frequency response function is a fundamental measurement that isolates the dynamic properties of a mechanical structure. It describes the input output relation between two points of a structure as a function of...

An input of 2.δ(t) is applied to a system and produces the response y(t)=6.e^-2t - 4.e^-3t Find an expression for the systems frequency response. The method used would be great too. I know there's some Fourier transforms involved.

Hi I am a bit unsure about terminology and method, so I would like to discuss this with anyone who knows anything about this. I'm examining the properties of a network of parallel capacitors. I have calculated an impedance versus frequency curve, Z(f), using complex impedance of the...

Why is frequency response an important characteristic of an amplifier? in this situation we are using a transistor and had to calculate gain using specified frequencies and the resulting voltages through our circuit. My understanding of contemporary electronics is not as strong as i...

Homework Statement http://img534.imageshack.us/img534/9687/rlc.png Cannot do this question, the first part confuses me when it asks to find an equivalent Parallel circuit. My first instinct was to try to add the capacitor and inductor and 40k Resistance together to create an RLC series...

Homework Statement Find the DC Gain and the Frequency Response of the above discrete-time system. The Attempt at a Solution This isn't really a homework problem but something I've been struggling with for my exams. I am given a transfer function in terms of z and am asked to find its...

This isn't really a homework question but I felt this is the most relevant section for this. I therefore apologize for not following the standard post template. I was going through my electrical engineering notes on frequency response functions. It was explaining how to plot frequency response...

I am trying to find the frequency response function given the input and output spectra from the picture i got that X(iw) = iU(w)U(2-w) - iU(w+2)U(w) and that Y(iw) = iwU(w)U(1-w) - iwU(w+1)U(w) So H(iw) = Y(iw)/X(iw) and H(iw) = wU(1-w) - wU(w+1) / U(2-w) - U(w+2) i am having...

Homework Statement Heres the question, I honestly don't know where to even begin :( An AC model of a cascode common-source amplifier is shown below. M1 and M2 are biased in saturation mode. The parasitic capacitors in the transistors are included. Determine the poles in frequency response...

Hi all, I have input force data and output acceleration data to calculate frequency response functions. As these data are in time domain I converted it to frequency domain using fft function in MATLAB. This is the procedure I used. As an example Let's think, Force matrix =a Acceleration...

greetings, At high frequency (more than 20kHz) the reactance of capacitor is very small and act as short circuit.this increase the loading of next stage.whats the meaning of increse of loading in next stage? RC coupled two stage amplifier circuit is here-...

Zero input means input equals zero the input is to some differential equation D2x = Dx + x + Input the input = sin(2pi * f * t) so say I want to make a program that solves for the zero input frequency response. (Matlab actually) what would I need to set the variable for frequency to...

Hi all, I have a problem with calculating frequency response function from measured acceleration and excitation force. The following sentences tell the method to follow. "In each test case, excitation signals from the shaker to the base were random. Each time signal gathered consisted of...

I have a frequency response diagram(frequency vs head) of discrete values. I have to perform Fourier analysis on these discrete values. The resultant frequency and head should be in FREQUENCY DOMAIN. how I can do this... by using FFT or any other ... using Nyquist frequency... please tell me...

i can't understand how they got the praph of the capacitator i clearly see that as the frequency goes up so does omega so the denominator goes up and the whole expression decrisses why does the gpath goes up as the frquency goes up

Hi all, I want to get Frequency Response Functions from ANSYS software. Can anyone give me a guideline? Thank you.

Hi looking for some help on the below I'm a little bit stuck. The effect of an earthquake on an elevated water tank is to be investigated. The water tank has mass m=2x10^6 kg and natural frequency wn=10.6 rad/s and a damping coefficient of 12% critical damping. Ground acceleration can be...

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)...

If I have a transfer function, and I need the frequency response of it, how do I go about doing it? Is there a easier way than inverse Laplace transforming it, then Fourier transforming that? Thanks

I am looking for a data acquisition system to replace an old Spectral Dynamics Siglab 42-20 system that I use to collect the frequency response of a smart material actuator our company manufactures. We currently run a stepped sine test between 50Hz and 2000Hz. This tests dwells at 50Hz, collects...

Hi, I'm trying to model the frequency response of a thin PZT disc using COMSOL, but I am not sure how to calculate the impedance Z vs frequency. I defined the current density at the top electrode as I=-imag(nJ_smpz3d) and then plotted V/I using the domain plot parameters in the postproc menu...

Consider a system with m = 100, c = 100 and k = 400. If y(t) = 3sin(1.5t), determine x(t) and ft(t). I don't have a picture handy but the equations for the system turn out like this. mx''+cx'+kx = cy' + ky Transfer function = x/y = cy' + ky / mx'' + cx' + kx then w/a laplace...

In my control theory textbook, frequency response descriptions is one of three main areas of the subject (the others being Laplace transfer functions and state space representations). My questions are: What is the purpose with frequency response in control theory? Why are not transfer...

I've run an experiment on an active filter. I am using the NI Elvis prototyping board. The frequency response is taken with the NI Bode analyzer and I saved the output data in a text file. The Bode analyzer amplitude spec is give as 12 or 16 bits, how do I calculate the amplitude error using the...

Homework Statement y[n]= (x[n]+x[n-1]+x[n-2]) / 3 is the input output relationship Homework Equations Find the Frequency response. The Attempt at a Solution Ok I am very aware that I can easily find the impulse response and graph this and I can even get the general format for the...

Homework Statement A linear time-invariant filter is described by the difference equation y[n] = x[n] - x[n-2] a) Obtain an expresson for the frequency response of this system. b) Sketch the frequency response (magnitude and angle) as a function of frequency. 2. The attempt at a...

Hi All, Firstly this is not homework etc but something i found on the internet that i need some help with. It is for the frequency response of subsurface metal targets. IE Metal Detectors etc. My take on this as with some others that i have read is...

Homework Statement This is related to the frequency response topic. Given transfer function G(s) = 4/(s+1) and input is sinusoidal i.e. 2 sin (10t + 10) Homework Equations None. The Attempt at a Solution I have found out that the magnitude of the transfer function G(s) is...

Hello Can anybody please help me to perform a Frequency Response Function analysis in ANSYS many thanks in advance

Homework Statement The relationship between the input voltage V(t) and the output voltage across a resistor VR(t) is:- CR dVR /dt + VR = CR dV/dt Circuit diagram of a capacitor and resistor with VR(t) in series across V(t) 1. Show that the frequency response function G(iw) (w= omega)...

Today I did a lab on BJT amplifier frequency response. I got the fc1 and fc2,BW and F0 center frequency. The band pass turned out to be asymmetrical. What i want to know is this. Input V=40mVpp output V=2Vpp cut off V=1.41Vpp When I turned up the frequency to 2fc2, i got about...

I'm trying to plot the frequency response of a power supply I've designed. Here is the netlist (made using Spice OPUS): PowerSupply v1 4 5 dc 0 sin(0 34 60) D1 4 2 1N4007 D2 0 5 1N4007 D3 5 2 1N4007 D4 0 4 1N4007 c1 2 0 1000u c2 2 0 100n cout out 0 100n radj adj 0 5k r1 out...

Homework Statement How do we find the frequency response for a circuit (RLC / transformer ckt)? If i have its * resonant frequency * Q factor * bandwidth Homework Equations just a general question The Attempt at a Solution like my other post but i have all the answers to the first parts...

Hi everybody, I had a simple question that I've never really thought about until I actually had to do it... If you input a single one frequency signal, will you get a whole new different frequency response? How would it effect the system? Or would it make sense if you inputed like a...

Hello, I'm studying the attached circuit in my first order frequency response chapter, and I swear this thing is a second order circuit (in terms of the transfer function v1/v2), am I doing something wrong?

The circuit of interest is the basic circuit for a Fender Stratocaster guitar. A diagram can be found at http://www.seymourduncan.com/support/schematics/S_1singlecoil_1vol_1tone.html . Basically an electric guitar works by vibrating a metal string in a magnetic field. This in turn causes a...

I am trying to find the frequency response for the given circuit. My instructor recomended using a nodal analysis method. However, while attempting to use the nodal analysis I end up with all my variables equaling zero (Va = 0, Vin = 0 and Vout = 0). Is there something I'm missing or over...

Can you help me find frequency response for the system. Thanks h(n) = (a)^n*cos(n*pi)*u(n)

Hi, I have a question pertianing to the effect of capacitance of BJT amplifier circuits on the low and high frequency response of the amplifier. Why is it that the coupling and the decoupling capacitors, in effect, only affects the low frequency response of the amplifier, and why is it...