Thank you for the replies, and sorry for the lack in given information.
The values for the filter I used, is computed from the LP scaling rules and Butterworth LP filter-table given in Horowitz-hill p. 654. I have supposed I need only 3 poles (don't know if this is enough, but want the filter to be easy to implement and with few components). I have a load on 100
hm: and with a frequency at 8MHz, according to the LP scaling rules this will give the following values:
C10=C20=200pF
L2=4uH.
The frequency will not change throughout the circuit.