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?

The voltage at the input and the voltage at the output are equal inthis circuit.

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