# Questions tagged [frequency-response]

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### 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 ...
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 ...
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, ...
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?
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.
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 ...
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 ...
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 "...