Questions tagged [frequency-response]

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1answer
340 views

Writing long PLC code routine without scan-time over-run

I wonder if is a problem with response time of PLC in some cases? If so, what is the case? How to designer it solves ? For example calculation are to complex, the next step must be calculated in 200 ...
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4answers
3k views

Why is impulse response of LTI system important

Why is the impulse response for a LTI system also called its system response? What is special about the output when the input is impulse signal? I understand that impulse signal contains all the ...
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1answer
537 views

How do PID controllers effect time domain and frequency domain response

I have been asked to use sketches to show how varying P, I, and D settings effects an output response in both the time domain and the frequency domain. I've have been taught how to, and done myself, ...
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1answer
428 views

Obtain transfer function of op amp circuit

I'm trying to find the transference function H(s) of the next op-amp circuit: I get the next following equations: When I put the equations together, this is an absurd. How do I solve this?
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2answers
846 views

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.
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1answer
109 views

Frequency Shift a Bode Magnitude Plot

for the 2nd order response of $$1-\dfrac{2\zeta\omega s + \omega^{2}}{s^{2}+2\zeta\omega s + \omega^{2}}$$ I get the plot shown in blue. How do I go about getting the plots shown in red and green ...
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1answer
442 views

Why two 2nd order filters have different roll off?

I have designed these two butterworth filter for 1.5k cutoff frequency. what it surprising me that roll off of first design is more than roll off of second design. According to me both are 2nd order ...
4
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5answers
3k views

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 "...
2
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1answer
3k views

3-dB Frequency of second order transfer function

How can i obtain the 3db frequency of the each transfer function ? My attempt: My guess is both transfer functions have the same 3db frequency.But equating the magnitude to 0.707 gives a fourth ...
3
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4answers
2k views

Inductive reactance: frequency vs current. Why current goes to zero as frequency increases?

Suppose I have the circuit below with the frequency of the voltage source as a free parameter. Assuming the inductance is constant, the current flowing through the circuit shoud equal $$I(f) = \frac{...
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2answers
6k views

Type of Filter from pole-zero plot

If the zeros were on the imaginary axis, it sure would have been a NOTCH filter. But, since the complex conjugate zeros are on the left of the jW axis, the transfer function has second order terms ...
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1answer
571 views

What determines the required bandwidth of current sensors in an electric motor drive?

Most motor drive control systems incorporate current feedback of some description. What determines the required frequency response or bandwidth of the current transducer? Is there any other ...
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2answers
240 views

Frequency Response of 1st Order circuit

I am having a bit of trouble trying to figure this out. The equation I come up with keeps canceling Omega out. $$Attempt$$ Converting the circuit to the frequency domain the capacitor becomes \$\...
11
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3answers
5k views

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 ...
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1answer
2k views

Step response of feedback system

We have a feedback system F(s) as in this figure: and this is the step response of G(s): and H=10. F(s): We got the root locus of the system F(s) as this: then we determined the gain at ...
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1answer
2k views

What is the ramp rate of a battery used on the grid?

For grid applications, I am looking for typical ramp rate of Li-ion batteries. I am specifically interested in batteries used for frequency management. So suppose I have a 1MW grid connected battery ...
4
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1answer
58 views

Is \$f_{\text{hfe}}\$ independent of BJT capacitances?

Bipolar junction transistors (BJTs) exhibit a gain rolloff as a function of frequency known as \$f_{\text{hfe}}\$, closely related to the device's transition frequency, \$f_T\$. As I understand it, ...

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