I have a 3rd order differential, passive low-pass filter prototype I'd like to wideband-match into a load. Source impedance is on the order of
10 ohms single-ended equivalent and the load on the order of 100 ohms.If I try to use the LC filter itself to match those two the calculator (this is for single-ended) e.g.:
shows insertion loss is unacceptably high. A wideband matching transformer somewhere in-line seems necessary.
But there are a lot of variables here, what impedance the prototype should be normalized to, how to scale the values of the filter prototype if say the inductance ends up unreasonably small, whether the matching transformer comes at the source end or the load end and what impedance it should match into, etc.
Just generally looking for advice on how to design a topology of this type to minimize insertion loss and loading of the source