aaron_do
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Hi mixed_signal,
you do need to resonate the balun in order to minimize loss. However, as I remember it, the balun will give you a wider bandwidth than if you had used an LC. Also, for high impedance ratios, baluns are also less lossy. I wish I had my previous references with me so I could give more information, but it would be quite a chore finding them since I changed jobs.
There are papers on power amplifier design which do a lot of analysis on baluns if you are interested. If I remember correctly, look for an author named Ichiro Aoki formerly from Axiom...
regards, Aaron
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