Hi folks,
I know that, in case of low pass filter, or high pass filter, the cut 
off frequency is equal to 1/2*pi*RC.
So how about if I have a R and C in parallel? does it behave as a low 
pass filter? does it have the same freq?

Thx,

Thomas

>So how about if I have a R and C in parallel? does it behave as a low
>pass filter?

Without additional series element? No. Or is the input driven by a 
current source?

So if the R//C does not have any influence on the frequency, how about 
this circuit? How can we calculate the cut off freq of it?
Thanks