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Questions tagged [frequency-response]

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Derive an expression for the current of a RLE rectifier

I'm trying to calculate an expression for this RLE rectifier: simulate this circuit – Schematic created using CircuitLab With \$R=2 \Omega\$ \$L=20 mH\$ \$V_{DC}=100 V\$ \$V_{m}=120 V\$ \$...
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1answer
33 views

Audio Frequency Response Offset in dB

Say I have some audio device with the following absolute frequency response: I want to shift the curve up, so that the 1kHz point is the 0dB point, and everything else is relative to this point. Am I ...
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2answers
121 views

High Pass Filter Design from Transfer Function

I need to design a circuit that implements the following transfer function: \$G(s)= G\frac{s+z}{s+p}\$ where, G = gain, p = pole and z = zero.
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1answer
17 views

Relation between bandwidth, response time and disturbance rejection for a control system

I read the following line in a control system book: Higher bandwidth corresponds to better command following, disturbance rejection and sensitivity to parametric variations. On the other hand, ...
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36 views

Measure the frequency response of a current probe

I need to measure the frequency response of a current probe, whose frequency range goes from 120 Hz to 60 MHz. I know that I have to use a signal generator, the probe and an oscilloscope. But how do ...
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36 views

System requirement in frequency domain

Hi Can any one help understanding and interpreting figure 6a and 6b (page 6) in the paper attached down bellow : I need to identify first the transfer function of each plot and then interpret system ...
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1answer
28 views

How is the sweep type affecting the Bode plots for the same AC analysis in LTspice?

When I do an AC analysis for the following circuit between 0.1Hz upto 20MHz, and by selecting "decade" in sweep types I obtain the following plots: But if I do exactly the same thing only this time I ...
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1answer
359 views

Frequency response of MCU decoupling capacitor

I'm designing a board that contains an MCU and an 8 MHz crystal. I was planning on keeping the MCU power/ground localized and isolated from the main power supply power/ground except at a single point. ...
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1answer
25 views

VFA vs. CFA Compensation Capacitor Comparation

Here, I am referring to voltage-feedback amplifier (VFA) and current-feedback amplifier (CFA). A basic schematic is given below for each. I.) VFA II.) CFA I am curious about the position of ...
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37 views

frequency response of transducer

I need help reading a spec sheet for a microphone. I'm conducting frequency analysis to determine the natural frequency of a batch of specimens. According to ASTM E1876 7.Apparatus(7.3 Signal Pickup):...
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2answers
52 views

Gain of Inverting Active Bandpass Filter

For the filter below I calculate the transfer function $$H(j \omega) = -\frac{R_2C_1 j \omega}{(1+C_1R_1 j \omega)(1+C_2R_2 j \omega)} $$ and thus calculate the gain $$A= \sqrt{ H(j \omega_o) H(- ...
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1answer
60 views

How are op-amp gain vs frequency response curves generated?

I have been wondering this for a while. When we look at the electrical characteristics of a device such as an opamp there is a gain versus frequency plot. I have couple of questions regarding ...
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50 views

What is the relationship between an amplifier's step input and the frequency sweep response?

What is the relationship between step input response and the frequency response of a system such as an amplifier? I see similarities between the step input response of an amplifier and the frequency ...
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1answer
52 views

Simple OP-AMP Frequency Response

In my textbook, there are two interrelated equations. 1. wb = wt / (1 + R2/R1) 2. wb = wt / Ao where ...
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22 views

What is the maximum number of natural frequencies given circuit elements?

I'm learning forced and natural responses, as an exercise the textbook gave 4 scenarios (2R&C, R&2C, 3R&2L, and 2R&C&L) and asked what the largest number of natural frequencies for ...
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1answer
60 views

Loop Gain and Phase Margin Correlation

I have found a definition of phase margin of amplifier system from Texas Instruments application report. This definition looks like this: $$\phi = tan^{-1} (A \beta)$$ where \$ A\$ is amplifiers open-...
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49 views

Frequency response of linear DDS chirp

I am performing a linear frequency sweep from 80 MHz to 120 MHz in 26.84 ms with the AD9910 direct digital synthesiser. I experience that the output amplitude is not constant (see Figure 1). With my ...
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2answers
116 views

How to define a transfer function for a given system?

I just finished reading this paper, on how to "draw" Bode plot for a given transfer function. After done reading I realized that it would be pointless to learn this stuff, if I wouldn't know how to ...
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1answer
65 views

Potentiometer Range in Speaker Frequency Response Curves

In several speaker spec sheets from CUI a frequency response curve is given, such as in the CLS0231MA-1: Notice the two y-axes: one for the potentiometer (0 dB to 50 dB) and one for the DUT (0 dB to ...
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79 views

What is the effect of PCB trace length to a capacitors frequency response?

I want to know the effect of PCB trace length to a capacitor's frequency response, especially in terms of bypassing and decoupling applications. For instance in the above simplified PCB, we have a ...
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3answers
93 views

What is the time derivative at t=0 for a second order low-pass step response?

For a first order system like an RC filter you have something like $$y(t)=1-e^{-\frac{t}{\tau}}\\ y'(t)=\frac{1}{\tau}e^{-\frac{t}{\tau}}\\ y'(0)=\frac{1}{\tau}$$ But for a second order system there ...
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1answer
25 views

Impedance response of a linear system is independent of the perturbation amplitude?

I'm studyng electrochemical impedance spectroscopy. On my book there is the sentence: "Impedance response of a linear system is independent of the perturbation amplitude.". Why? If I have a non-...
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76 views

Frequency response of an ideal LC circuit

Does the frequency response of an ideal LC circuit exist? The frequency response of a system is defined as: $$\int_0^\infty{h(t)e^{-j\omega t}dt}$$ where \$h(t)\$ is the system's impulse response, but ...
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53 views

Determine capacitor value gives amplifier characteristic independent of frequency

I have an amplifier for the needle EMG electrodes signal like image below. The question is : Determine the C2 capacitor value gives electrode–amplifier characteristic independent of frequency. Can you ...
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1answer
247 views

Frequency response of a parallel RC filter (smoothing capacitor in rectifier circuit)

I understand qualitatively and electrically how a smoothing capacitor works in the case of a diode-based full-bridge rectifier but what I am not too certain of is how to describe it in terms of its ...
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1answer
42 views

What's oscillatory instability in the delay differential equations?

Does DDE’s stability depend on forcing term and ODE’s stability does not depend?If yes, then is frequency analysis of stability applicable only to DDE and not ODE? In control systems, we study ...
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2answers
74 views

RC Filter measured response differs from calculated transfer function

I've created a first-order RC filter with R = 68 Ohm, C = 5.0 uF, and I am studying the transfer function of this filter. I have calculated the transfer function to be 1/(1+jwRC), based on the ...
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2answers
85 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 ...
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4answers
219 views

Units for fourier transform of measured voltage

I have a measured voltage signal that I want to present in the frequency domain. My current process is to take the FFT of the signal, then use \$20 \text{log}_{10}|X|\$ where \$|X|\$ is the magnitude ...
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3answers
182 views

What is small signal. And what is small signal equivalent circuit

I am very new in electronics. And this topic is bothering me. I want to know what is small signal and how to draw a small signal equivalent of jfet with common source.
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1answer
56 views

How can infer instability from the frequency response of control system?

When can we judge a control system to be unstable from its frequency response?.For example, thermostat computes the error signal (desired room temperature - actual room temperature) and then actuates ...
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2answers
423 views

How to calculate amplifier gain (in dB) using frequency?

I know how to calculate decibel gain using the ratio of power, or Vin/Vout. However, is there a way to calculate the magnitude of the attenuation and phase angle when you’re given the cutoff ...
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68 views

Frequency domain representation

I'm studying the space-state representation and I'm not understanding a simple situation that I created. I created the following system, on the frequency domain: By writing the time domain ...
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175 views

Speed of response and crossover frequency relationship

In SISO(Single Input Single output) cases, My professor keeps mentioning the speed of response and crossover frequency interchangeably. I don't really understand what the speed of response means also ?...
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3answers
92 views

Does an analog filter with complex impulse response exist in application?

Do we have in practice any analog filter that has a complex impulse response? Or they must have a real impulse response? Particularly, I am looking for a low pass filter that passes only a band in ...
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2answers
124 views

Double Peak Phenomenon in Transimpedance Amplifier Simulation

I'm simulating a transimpedance amplifier circuit in order to replicate a phenomenon that my team is experiencing. The phenomenon can be seen below in the image circled in red: My photomultiplier ...
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1answer
52 views

Can't draw bode curve of this zero

I have a transfer function like this: \$H(s)=\frac{s^2+\frac{1}{LC}}{s^2+s\frac{R}{L}+\frac{1}{LC}}\$ I can separate the denominator into an expression of the type: \$(1+s/a)(1+s/b)\$ and then plot ...
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2answers
379 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 ...
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1answer
61 views

frequency response multistage

hello every one i need ask about frequency response i have an old question of our professor exam in few year, and i try to solve this question many time but i can't so please if any one have idea ...
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1answer
720 views

OrCAD PSPice less than 2 connections error while simulating

I just started using PSPice and I don't know much circuits theory but I need to simulate this circuit and find Vout/Vin: I did this using capture but after running simulation I get this error: ...
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3answers
130 views

Transfer function gain [closed]

\$H(s)\$ is the transfer function and we're looking for its magnitude gain. I went from the Laplace domain to the frequency domain by replacing \$s\$ with \$j\omega\$. However, the solution didn't ...
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1answer
164 views

Frequency response of state variable filters

Could someone explain the difference between the following responses of a state variable filter? It looks as though the band pass response is approximately 3dB lower in the second image. Assuming a ...
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2answers
2k views

How to design a 2nd Order High Pass Butterworth filter with a gain of 6 dB?

I have been trying to design a 2nd order filter with a gain of 6 dB (or 2 Av), using the following Sallen-Key Topology. I have calculated R1 and R2 to give me a desired cut-off of 1.6kHz and this ...
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2answers
368 views

sampling rate and frequency response of a vibration sensor

I am trying to measure the vibrations of a lathe machine using a piezoelectric accelerometer sensor. I want to know if the sampling rate can be set at a value greater than the flat response frequency ...
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3answers
1k views

Does a voice coil vibrate at the same frequency as the source sound file?

As a disclaimer I know very little about this so I'm probably describing this in a very imprecise way. Say you generated a sine wave on your computer at 800Hz and played it through a speaker. Would ...
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0answers
47 views

The reason that gain and phase are all constant

Here is a cascode amp by p686,Baker's CMOS Circuit Design,Layout,and simulation.The size of MOS are the same as this book,and \$R_s\$=100k and \$C_L\$=100p ,are from p687,ex21.12. So only VDD,3.3v, ...
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53 views

Determining the phase margin of a negative series-shunt feedback circuit

I have been given a transfer function: \$H(s)={A_0\over (1+s/w_{p_1})(1+s/w_{p_2})} \$ With the condition that \$w_{p_1} << w_{p_2}\$ It's designed for this feedback circuit ...
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1answer
289 views

how to measure phase response of filter

I have a lowpass filter (0 - 2MHz). I wanted to measure the phase response but I am a little bit confused. I have a signal generator and oscilloscope. Any tips how I could accomplish that? Edit: ...
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1answer
118 views

What does it actually mean by that a transducer has good dynamic response?

One of the basic requirements of a transducer is that it has good dynamic response. I am having trouble understanding the meaning. My textbook says: The output of the transducer should be faithful ...
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0answers
57 views

Necessary phase shift of op amp

My lecturer said that, for any system where the amplitude response varies with frequency, such as for an op amp, there will necessarily be a frequency-dependent phase shift between the input and ...