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I wonder why attached LP filter calculation does not compute.

I am considering the node P1 as a complex node yet my approach is obviously wrong.

The only way to solve this problem is with the use of good old KCL which makes

[tex]I_3-I_2-I_1=0[/tex]

You would however also need to consider that the differential input is zero and that

[tex]U_-=U_o/Av[/tex]

Yet I think my approach is more intuitive.

What am I missing?

Best regards, Roger

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# LP filter calculation problem

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