Amplification of an integrator and a differentiator

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The discussion focuses on the amplification formulas for integrators and differentiators in electronics, specifically the meanings of terms like Zf, Zin, j, and ω. Zf and Zin refer to the impedances in the circuit, while j represents the imaginary unit, crucial for understanding complex numbers in electrical engineering. The term ω is defined as the frequency of the oscillating signal, with a relationship to the RC time constant. The user expresses confusion about the implications of these terms, particularly regarding phase lag and amplification characteristics. Overall, the conversation highlights a desire for clarity on fundamental concepts in electronics despite the lack of immediate exam relevance.
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Homework Statement



The amplification of an integrator is:
A = Vout/Vin = -Zf/Zin = +j * 1/(ωRC)

The amplification of an differentiator is:
A = Vout/Vin = -Zf/Zin = -jωRC


Although, that's what my book says. Not that I doubt it..

But really, what do Zf, Zin, j, and ω stand for?
I can't find much about it.


The book only says the following:
ω = 1/(RC), but why? what does this mean?
and that Vout 90° lags (-j) at Vin, regardless the frequency.
Thus: A is (straight?) proportional with the increasing frequency, so increases with 6dB each octave/scale and with 20dB each decade/level.

But really, I have no idea what this actually means.


In the classes we didn't attend this to the matter and we don't have to know this for the upcoming exam. But I'm just curious ;)



Thanks in advance,
Young
 
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I'm not sure about what you understand and what you don't... Do you know what \omega stands for? And j? If you don't... what do you know?
 
jrlaguna said:
I'm not sure about what you understand and what you don't... Do you know what \omega stands for? And j? If you don't... what do you know?

SYoung said:
But really, what do Zf, Zin, j, and ω stand for?
I can't find much about it.

Well... nothing about these 4 terms, really.
We didn't attend this part of the integrators to the matter at all but I'm just curious about it! ^^

For ω, I understand what 1/RC means. But not where it comes from, what's behind it?
And j, 90°? Does this mean the real wavelenght is 1/2π earlier, where does this lag come from? And what has this to do with the amplification?
And Zf and Zin, what do the Zs stand for? Zener-final and Zener-initial? Is there any Unit in the SI-system for these?

So as you can see, I'm just guessing around.
What do these symbols stand for?
 
Hm... you need some background in electronics. Zf and Zin stand for the impedance, which is a complex value, hence the j=\sqrt{-1}. And \omega is the frequency of the oscillating signal. If all this confuses you, take a look at http://en.wikipedia.org/wiki/Electrical_impedance.
 
Okay I think, after reading reading that link you gave me, I've got a better understanding of it now. Not 100% clear, but I was just curious about it and I'm really tired. Just had prelims/exams (what do you call it again? :smile:) the last 2 weeks.

Anyways, Thanks a lot!
 
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