i asked this question in some german forums, but no one could help to explain. Maybe the english's can do.

How can I calculate the transfer function between UA/UE ?

The transfer function is defined as G(s)=UA/UE. And s is a substition of s=jw with w as the circular speed.

My fist idee a was a superposition:

\[ G(s)=G_1(s)+G_2(s) \]

\[ G_1(s)=\frac{U_1}{U_e} \]

\[ G_2(s)=\frac{U_a}{U_1} \]

And U1 ist function which describe the voltage between C1 and R1.

Is it allowed to calculate like this ? Because I could not finde any Information about this.

Thanks for your help (sry for my broken english)