Questions tagged [frequency-response]

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Cartridge heater frequency response

Does anyone know the typical frequency response of a cartridge heater? Normally they work from 120/230 Vac 50/60 Hz, but I would like to know: If it is possible to use a DC source (120/230 Vdc). What ...
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36 views

Gain error calculation for op-amp circuit in inverting configuration

For an inverting op-amp, calculate minimum gain that is required for the op-amp to achieve a gain error of 1%, if the required closed-loop DC gain is -9. If the input resistance R1 is 1Kohm,find the ...
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3answers
92 views

Level transformation 0/+5 V TTL logic to +/-9V how to maximize gain and frequency range (DC to 4 MHz)

I see a lot of repeat answers and instructions how to convert dual supply levels to logic levels, but I have the inverse situation, converting 0/+5 V TTL logic to +/-9 V, and I don't see a lot of info ...
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1answer
51 views

Analog CMOS Design

I have been studying CMOS design from Baker's book. In the amplifiers chapter he places a "big" resistor between the input gate and output drain of CS derived amplifier stages. What is its ...
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48 views

Emulate impedance response using RLC components

I need to emulate measured impedance response of some blackbox using only RLC components. Measurements: ...
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37 views

Frequency response measurement problem with mobile phone: same (wrong?) readings for different speakers

I have built some bespoke speakers and tried to measure their frequency response. My rig is: Source: Android phone Samsung A3 as a source, playing frequency sweep using Android's Frequency Generator ...
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3answers
379 views

Transfer function of electrical network

I need help with this problem. The transfer function that I found is ((RCS+1)/(2RCS+1)) , but then I cannot go further because the form of T.S is untypical. The typical form of this question is RC ...
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1answer
83 views

Why does this ramp generator drop level outwith 60Hz / 10kHz range?

I found the following circuit in an old Elektor article: It is a [edit: ramp generator] that repeatedly (a) charges C3 through R4 to build a ramp, and (b) briefly shorts C3 across T1 to reset the ...
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1answer
69 views

What is the different bewteen the minimum attenation in butterworth and Chebyshev filter?

I have desgined n of a low-pass butterworth whose specification are fc=1khz , fs=2khz, Amax = 1 db and Amin=40 db. I found that I need to make sure the n gives me larger Amin which = 40db. So I ...
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1answer
90 views

How to explain the peak frequency and resistance relationship in this op amp circuit?

I was studying thid tutorial by Simon Bramble. I changed the original circuit a little bit and this is the subject of our discussion: As you see, R1, R2 and R3 are all 1kOhm. When I run an AC ...
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25 views

Realisation conditions for impedances

Given a frequency function, which conditions should it fulfill to be realisable and implemented as a one-port impedance? I know that for it to be realisable with passive RLC components, the frequency ...
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26 views

Differentiator Op-amp with a triangular wave

I’m trying to create a differentiator op-amp. The input signal is a triangular wave of frequency 100Hz and amplitude 1V. The circuit I have designed features a series resistor (Rin) and capacitor. ...
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1answer
77 views

SuperHeterodyne receiver

In a superheterodyne receiver, let us assume, I have a signal in the RF range of 88MHz to 108MHz. From what I have read, my understanding is that by tuning the local oscillator frequency, we can make ...
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1answer
36 views

How to visually determine the damping ratio when we know the peak amplitude

I am currently trying to understand this example from the book, where it visually calculates the dampening ratio given the peak amplitude as well as the natural frequency. Here is the graph from which ...
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1answer
50 views

Why isn't my the LTspice cutoff frequency for my multiple feedback low pass filter not matching?

I am designing a 6th order multiple feedback lowpass filter with cutoff frequency at 1000 Hz. I wrote a matlab script that calculated the capacitor and restore values. I combined all transfer ...
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28 views

Determining Z1 for voltage divider of RF Matching Circuit

I have a problem where I was given an RF circuit with a series RL load. I am tasked in finding a matching L circuit and determining the values of the components. I used a smith chart to determine that ...
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5answers
125 views

Why are the theoretical and measured frequency responses off a low pass filter different?

The calculated/theoretical value for the cutoff frequency was different to the measured. What is the reasoning behind this other than measurement errors? It should be noted that this was a simple ...
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1answer
1k views

What does a bode plot represent and what is a pole and zero of bode plot?

I studied bode plot and the author of book is somehow relating zeros of transfer function to bode plot. What is the relation between zeros or poles of bode plot and transfer function? We usually take ...
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3answers
330 views

More equations than unkowns in amplifier circuit

I am trying to find the Magnitude Response of the gain of this amplifier circuit. The gain formula is: $$ H(\omega) = \frac{\tilde{V_{out}}}{\tilde{V_{in}}}$$ My amplifier circuit is as follows:...
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2answers
45 views

Automated Approaches for Measuring Audio Amplifier Frequency Response

I'm looking for a DIY or professional method for easily measuring frequency response of an audio system from 10Hz to 10kHz. It is for a guitar amplifier, and I would like a better way to characterize ...
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5answers
742 views

Why does a square wave in frequency domain have less amplitude?

For a square wave in time domain to frequency domain, the amplitude decreases, as shown in the spectrum image below. I dont understand why the amplitude decreases. In the time domain, it looks ...
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0answers
48 views

General question about convolution and Fourier

I'm working on a system that includes a bunch of elements and I arrived at the following general expression for the output: $$\mathcal{F}\left\{ T\cdot\left(\left[T\cdot\mathcal{F}\left\{ E_{1}\right\...
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56 views

How to separate magnitude and phase response in Proteus?

I have an all-pass filter in Proteus, which in theory doesn't change phase. but changes amplitude. How can I see both of the graphs? Here are the needed scheme and its analogue in Proteus. Although I'...
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2answers
181 views

Bandwidth of pentode amplifier

Why is the bandwidth of pentode amplifier larger than the bandwidth of triode amplifier? I have searched the following books but can't find the answer: Electronics devices and circuits by Rajiv ...
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30 views

How to Select Prony Method Order?

I'm implementing a Prony decomposition to analyse power system signals in python. I think the code is generally working, but reconstructing a signal from the decomposition shows that it's not "perfect"...
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2answers
108 views

Why does the \$ Q\$-factor depend on the resonant frequency?

The \$Q\$-factor is defined as $$Q=\frac{\omega_{0}}{\Delta \omega},$$ where \$ \Delta \omega\$ is the bandwidth around the resonant frequency \$ \omega _{0}\$. For a series RLC circuit, $$\Delta \...
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1answer
85 views

How to get a flat band frequency response with an inductive input

I have a primary inductor L1 connected to a voltage source with frequencies varying from 0.5MHz to 15MHz. This primary inductor induces a voltage across a secondary inductor via coupling and I want to ...
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1answer
64 views

3-dB frequency of cascaded opamps

We have two identical opamps with a first order low-pass response. They both have the same 3-dB frequency \$f_1\$. I need to show that their combined 3-dB frequency (when they are put in cascade) is: ...
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3answers
162 views

Frequency response of this circuit

Im not sure how to find the frequency response (\$H(jw)=V_o/Vin\$) of this circuit Can anybody help please?
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49 views

Frequency Response of Current Transformer?

I want to get frequency response of an CT in practical applications. Current transformer is nonlinear systems and i want different ways to get it in practice. Which software is better for analyzing ...
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88 views

RFI filter modeling in LTspice w/ triac

I have a few questions about modeling an RFI filter in LTspice with a triac-based dimmer circuit. I'm referencing the circuit described in Figure 11 in Triac Principles and Circuits -- Part 2 (Nuts &...
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1answer
111 views

Replacing s with jw in transfer function. When the input function is oscillatory and has exponential decay

I understand a version of this question has been asked numerous times before but I could not find an answer to this specific one. This is how I understood replacing s with jw. From the impulse ...
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43 views

Improve the frequency of Current Source Howland effect Op-Amp

I need help on a Howland Effect circuit with a current source purpose with an output of 600mA and a constant gain throughout a range of frequencies starting in 0Hz to 1Mhz. I am currently using an ...
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1answer
455 views

High vs Low audio transistor hFE (DC Current Gain). Which is better?

I'd like to preface by saying Rest in Peace my SoundBlasterX's back-panel transistors. What I tried to do, shown in the images below was ground the copper heatsinks I had glued onto the metal side of ...
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11 views

Insertion loss measurements, frequency sweep vs measuring points with a constant driving frequency

I have been modelling a surface acoustic wave delay line, and am trying to clarify what I am seeing in the different models and whether this is applicable to what would occur experimentally. In the ...
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2answers
268 views

Frequency Characteristics of Low pass filter

Can anyone explain to me how I would find the frequency charactertics of a low pass filter? How can I choose frequencies and find corresponding gains? Is the frequency from the x-axis constant or ...
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1answer
89 views

Capacitor as filter, physics behind choice [duplicate]

I am tapping into the output voltages (signal wire) of various sensors on a vehicle, and I would like to use decoupling capacitors to filter out noise. As others have stated, a rule of thumb is to ...
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2answers
760 views

Dominant Pole Approximation

I am studying Microelectronics by Behzad Razavi, 2nd Ed., where in the frequency response chapter it uses the "Dominant Pole Approximation" to find one of the poles easily from a quadratic denominator ...
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79 views

2 Crossovers in parallel: how are frequencies distributed?

So, the other day I connected on parallel a dual-voice subwoofer-system (a Pyle XSUB1-150-4-12d crossover — like this one ... link might be unavailable after Aug 28, 2019 ... — and 2 individual ...
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1answer
67 views

Frequency response of MEMS sensor in datasheet

I am looking for a MEMS acceleration sensor and the frequency range of 0 to 20 Hz is required. But after checking a lot of datasheets I am confused. Because in most datasheets I am unable to find any ...
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4answers
91 views

Is the frequency response of a circuit only valid for steady state (phasors)?

This is my first post. I just finished a course about advanced circuit analysis techniques (the content was taken from textbooks by Sadiku, Hayt and Irwin.) As you know, phasors are used to solve ...
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1answer
178 views

Difference between simulated and constructed filter

I recently designed a passive RL ladder filter to obtain certain specifications for anti-aliasing purposes (circuit shown below and simulated in LTSpice). The response I got in LTSpice was very ...
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2answers
546 views

How can I export the frequency response from LTSPICE without phase wrapping?

After I plotted the frequency response of a circuit using LTSpice as shown: I exported the plots data as a .txt file in order to plot them after that using MATLAB, however, after I plotted the data ...
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3answers
176 views

High Q peak in frequency response means what in time domain?

Reading Linear Circuit Transfer Functions and one of the graphs got me curious. I've recreated the circuit (series RLC) and plotted the frequency response for a Q of 7. We have a peak of ~16.3 dB ...
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1answer
38 views

Designing a network to fit specific amplitude and phase response curves

If we are given a frequency response curve made up of the amplitude (magnitude) and phase (angle) responses, is it possible to design an electronic network with a transfer function identical to the ...
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3answers
149 views

Why is the frequency of the response same as that of the forcing function in a linear circuit?

Why is the frequency of the response same as that of the forcing function in a linear circuit? What's the case when the circuit isn't linear?
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2answers
72 views

Impedance frequency response

Consider the following the frequency response of the impedance of a resistor component : We know that a resistor has a parasitic capacitance and inductance due to its leads. So the impedance of the ...
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2answers
107 views

Can't achieve the goals in designing and simulating Resonator circuit

Goals I need to design resonant parallel circuit and simulate it with LTSpice so that it match with the design requirements correctly. Requirements Source Impedance \$R_s = 100\ \Omega\$ Load ...
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2answers
217 views

Fitting of continuous transfer function

I measure a network's transfer function using a network analyzer and therefore have a set of complex data points, representing the network's gain and phase. I wish to fit a continuous, rational ...
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197 views

How can I estimate TL431 output voltage swings based on datasheet alone?

I am trying to design a series-pass regulator that brings 12V down to 3.3V. If I see a 20 mA step change in current, I would like to stay within a certain output voltage range (±2%). What parameters ...