I have a AD9958 application (10-200MHz) where the output voltage swing after balun and filter could well do with a little boost. So I wondered if I could simply use a 1:2 transformer to double the voltage and thus get around an extra amplifier. Has anyone in here given this a try? This almost feels too simple to make any sense
Yes, it does introduce an amplification factor on the voltage input. If you want to attain max pow transfer, in addition to the voltage amplification, then you should settle for RL = Rs*N^2. So setting up a voltage amplification is straightforward but simultaneously achieving it with max power transfer would require a matched condition.