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impulse response input signal

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preethi19

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Hi i have attached an image of impulse response. I learnt that impulse response is very high in magnitude for a short time duration. In the following link they have described a rectangular pulse of area 1 to be of impulse nature.
https://www.dummies.com/how-to/content/apply-the-impulse-function-to-circuit-analysis.html
So say i want to input a impulse signal to my systems then my input is nothing but a rectangular waveform??? Am i correct about this???

impulse.png

"Visualize the impulse as a limiting form of a rectangular pulse of unit area. Specifically, as you decrease the duration of the pulse, its amplitude increases so that the area remains constant at unity. The more you decrease the duration, the closer the rectangular pulse comes to the impulse function."
 

You still want the attributes of infinite amplitude and zero
duration, with a product of unity. But you can't have it -
only a cheap knockoff.

It may be a rectangle. That doesn't mean any old rectangle
will do.
 

So say i want to input a impulse signal to my systems then my input is nothing but a rectangular waveform???
Am i correct about this???
Correct.

You have to consider mainlobe of Spectrum.
Spectrum of Rectangular waveform is Sinc function.

Mainlobe of Spectrum has to be far wider than bandwidth of your system.

This means that width of recatngular waveform has to be enough narrow.
 

You are posting in the analog circuit design section, impulse response is however a theoretical concept found in signal theory and digital signal processing. It hasn't much to do with real circuits which neither support infinite magnitude nor zero signal duration.

Rectangular waveforms do exist in real circuits but only with finite bandwidth. Active circuits involve non-linear signal limitations like maximum slew rate.

"Impulse signals" in analog circuit designs are either idealizations in small signal analysis or real pulses with well defined magnitude and rise time which can be applied in transient analysis.
 

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