| Author |
Comment/Response |
devil
|
 02/02/13 2:06pm
Hi,
I want to calc the cutoff frequency.
I tryed for this the followed code, but don't work:
R1 = 1* 10^6;
C1 = 100 * 10^-9;
sys = (s*R1*C1)/(1 + s*R1*C1);
A = Abs[sys /. {s -> 2*Pi*fg*I}];
Solve[A == 1/Sqrt[2], fg]
--> I get the result:
{{fg -> (5 (I - Sqrt[2]))/(3*Pi)}, {fg -> (5 (I + Sqrt[2]))/(
3 Pi)}}
--> but it have to be 1/(2*Pi*R1*C1) = 5/Pi
Can someone please tell me, what I did wrong?
Many Thanks!
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