LNA Question
Hi,
Generally, this filter design as I think could be a solution with an LC filter or ceramic filter.
If only LC components, it could acheive 25dBc for rejection @ +/- 50MHz. If you want LC component network give 50dBc on this frequency, you will lose much inband noise performance.
Ceramic filter could be expensive but can give good ( such as 50dBc) rejection on outband without losing much inband gain. That could be use for the mirror frequency of mixer or other tough blocking requirement , when you have a system consideration.