I'm designing a circuit with RFICs using differential signaling. I'd like to keep noise to an absolute minimum. Let's use the mixer (LT5560) as an example. All of the reference schematics match to 50 ohms and use a balun to convert the differential inputs and outputs to single ended. I would like to use differential signaling to and from the mixer as my IC's on either side are differential. Converting to single ended and then back to differential seems wasteful. Why would none of the reference schematics take advantage of differential signaling when the datasheet strongly recommends it?
My main question is this: I know how to match the impedance of single ended signals, but how do I match the impedance of differential lines? My source impedance is not 50 Ohms.
edit: to clarify, I am not trying to match 50 Ohms, I need to match 2 different complex differential impedances. So, in this image, how do I calculate the correct component values to ensure maximum power transfer?