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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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 constant to me. Hard for to reason out. I just know that…
user3026526
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How does an op amp's bandwidth affect its rise time with a step input?

Can't seem to find the connection between the two. I have an error amplifier being fed with an analog signal. I'm varying the GBW of the op-amp to determine how does its GBW affect the rise time of the output. From my spice simulations, what i'm…
user266967
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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 variable?
Akila.sr
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Frequency response - all zeros smaller than all poles?

For the following circuit the middle band gain is: \$A_v=-g_mR_D\cdot R_{in}/(R_{in}+R_{sig})\$, where \$R_{in}=47\cdot 10/57=8.25M\Omega\$ and \$R_D=4.7 || 10k\$ The total resistance which the capacitor 0.1uF "sees" is \$10k+4.7k=14.7k\$ The total…
peripatein
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Frequency dependent impedance as an electrical circuit

I am having problems trying to custom fit a frequency dependent behavior. I want to be able to convert a frequency dependent impedance Z(f) into an electrical circuit of the sort 1. The input of the code is the frequency dependent impedance Z(f)…
Wallflower
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Zeros and Poles of an Amplifier

For a transfer function, a zero is defined as the value of s for which the transfer function's value is zero. A pole is defined as the value of s for which transfer function's value goes to infinity. However when dealing with transfer function for…
Ashii
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BiCMOS Amplifier with feedback for DC bias and AC

In the following circuit, to considerably reduce the effect of RG on Rin and hence on amplifier performance, another 10MΩ resistor was added in series with the existing one and a large bypass capacitor between their joint node and ground was placed.…
peripatein
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Miller's theorem and CS cascade

In the above circuit I was asked to find the input capacitance at the gate of Q1, Cg1, using the Miller approximation, to determine the frequency of the pole formed at the amplifier input in terms of Rsig, use the Miller approximation to find the…
peripatein
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Frequency response and the effect of phase

Lets say I have a low-pass filter in a sound system. I draw a magnitude and a phase diagram as a function of the frequency. Disregarding the magnitude, how does just the phase affect the sound we hear?
gamliel basha
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Mid- and lowband frequency response of CE

I'd like to derive an expression for the small signal voltage gain \$A(s)=V_o/V_{sig}\$ that applies in the mid- and low frequency bands. I know that for a CE the voltage gain would be: \$A_v = -g_mR_c/(1+g_mR_E)\$ Does that mean that \$A(s)\$ could…
peripatein
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Frequency response?

Is the frequency response dependent on the frequency type? (I believe it is) If so, why is it depended on the shape of the signal, square signal vs sine vs triangle. what equations govern it.
Sam
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Breville 800ESXL

This coffee machine is specified as using 110 or 220 volts but always at 60Hz. Will it work at 50Hz? I cannot see any issue except for the pressure pump not reaching its maximum speed.
Jorge
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