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Are this filters the same??

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gjfelix2001

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Hi, i just want to know if this filters are the same.

Filtro2.jpg
Filtro1.jpg


I ask this because i'm looking for the transfer function (frecuency response) for the circuit shown in the second image. I know the transfer function for the first circuit is:

\[H(\omega)=-\frac{Z_f}{Z_i}\]

Is this the transfer function for the second circuit too????

If it's not, how can i get it??

Thanks a lot.
 
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Awarapunshee said:
No difference at all and the transfer function will also be same for the 2nd one.

ENJOY!
Click to expand...

Hi gjfelix2001

Of course, Awarapunshee is right - but, do you know why ?
You should always try to understand why something is OK and something not.
 
Of course, Awarapunshee is right - but, do you know why ?
You should always try to understand why something is OK and something not.
Click to expand...

Hi LvW!!

I don't know why... First i wanted to know if the filters are the same. Can you tell me why??

I'm confused about this because i've seen there are two port networks, and the first circuit looks like one. I don't know anything about two port networks by the way.

Thanks to Awarapunshee.
Thank you..
 

The answer is very simple:

The second drawing is only a simplified version of the first one.
The first one is more detailed and shows explicitely the two input and the two output nodes - resp the input port and the output port.
And the second one ? If there is no additional information on the reference point for the voltages one always assumes that all node voltages are referenced to ground - as is the case for the first drawing.
Further questions?
 
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