Electrical Engineering Stack Exchange
Electrical Engineering Stack Exchange

Questions tagged [frequency-response]

For questions about the frequency response of electrical circuits. Also consider using the related "bode-plot" and/or "nyquist-plot" tag if your question involves a Bode and/or Nyquist plot, and/or the "stability" tag if your question is about the stability of an electrical circuit.

The response of an electrical circuit (both magnitude and phase) to an input as a function of frequency, often plotted as a Bode or Nyquist plot.

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What is the difference between frequency response and transfer function?

I would like to understand the difference between frequency response and transfer function. I know the former can be obtained by substituting \$s = j\omega\$. But what is the difference in information I can get from both representations? What are…
luis
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Why aren't active headphones equalized to a flat frequency response?

Some headphones are 'active', with amplifiers built into the cups and requiring a power source (typically AAA batteries). I then see many audiophiles discussing frequency response as a metric of how good headphones are, and they categorically…
Ehryk
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What does a Bode plot represent and what is a pole and zero of a Bode plot?

I studied Bode plots and the author of my book is somehow relating zeros of transfer functions to Bode plots. What is the relation between zeros or poles of a Bode plot and transfer function? We usually take zeros at \$s=-a\$ (let's say) but how…
Ali Aqdas
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Formula for Logarithmic (audio taper) pot

What I would like I am trying to determine the formula for an audio taper (logarithmic) pot. I would like a formula that takes R and P as inputs. R being the total resistance and P being the "percent on", i.e., in set [0, 100], and yields the…
Tim
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Why is a capacitor considered a short circuit at start up?

The frequency response of a capacitor says a capacitor has a high impedance at low frequencies and it has a low impedance at high frequencies (up to the capacitor's resonant frequency.) If we use a capacitor that has a decoupling capacitor, so…
JoeyB
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Transmission Line Transient Response To Step Voltage Prior To Any Reflections

This question seeks a definitive and precise answer to a question regarding the transient response of a transmission line. Figure 10 of TI Application Note snla026a contains a graph showing (among other things) the current into transmission lines of…
Math Keeps Me Busy
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Finding frequency response of inductive EMI sensor

I'm building an EMI sensor and trying to understand how it's done with the Elektrosluch. Here's the full schematic but this is the part I'm concerned about: simulate this circuit – Schematic created using CircuitLab I want to find the frequency…
Andrew Li
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Why do log sine sweeps traditionally start from low frequency?

I'm doing a log sine sweep to get the frequency response of a device. The software works fine, but the first low frequency half period introduces a bit of DC offset in the signal coupling caps, so the DC operating point of the thing moves a bit at…
bobflux
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Why are low values of resistor in non-inverting configuration of opamp causing gain peaking?

I am trying to simulate frequency response of TLV07 in non-inverting configuration for gain 10 as shown below: The frequency response shows peaking as shown below: It is worse for smaller values of resistors like 1 and 10: The response is…
needbrainscratched
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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 the speaker also vibrate at 800Hz?
Leftover Salad
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Why are there ripples in the passband of some filters, like the Chebyshev filter?

Please see the Bode magnitude plot as we steadily increase the input frequency to the filter. Why does the magnitude oscillate? What physical component(s) in the filter circuit is producing that oscillation effect in the magnitude plot? For…
ADHITHYA S
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What is the phase margin when there are multiple gain crossover frequencies

I am using LTPowerCAD to help design a buck converter circuit using the LT8645S. I would like to add a second stage LC filter at the output to achieve lower output ripple, but when I add the second stage, the bode plot of the loop compensation shows…
imnotarobot
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Frequency response of dual vs single op amp: OPA2890 vs OPA890

I am looking for an op amp to use as a unity gain buffer with a disable feature. The OPAx890 looks like a good candidate because it is unity gain stable. I have noticed that some op amps labeled as unity gain stable have worse stability than others…
DavidG25
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Laplace transform and the idea of frequency domain analysis

I have studied control theory in depth in my undergrad and still continue to use it on many occasions in my PhD work, but i still don't fully understand why we call Laplace transformation of system a "frequency domain analysis". I know that Laplace…
Udai F.mHd
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Frequency analyzer for loop gain measurement - Why should the injection point have low output impedance and high input impedance?

@5:08 The video mentions: "The insertion point should have a low output impedance and high input impedance" What is the background for this condition?
Divya K.S
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