Frequency response Definition and 87 Threads

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...

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...

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...

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

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...

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)...

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...