What is the correct way to utilize the ADL5569 Sparameters? Why is there not more LC match between the ADC driver amps and ADCs - the ref circuits utilize resistance match that throws away gain.
I downloaded a ADL5569 Spar file into Genesys - it is a 4 port files; ports 1&2 are INPUT, Zo=100Ohms; ports 3&4 = output, Zo=14Ohms. In Genesys, I connected a 1:2 balun at the input to step 50 to 100Ohms; for output , I used LC match from 14 to 50 Ohms. Results were reasonable; < -12dB S11, S22 at both ports over 220-400M, and flat gain = 22dB. Seems to me a higher gain alternative than the typical reference circuit. So, is there a catch - e.g can the driver amp output 2dBm (ADC full scale) while looking into 14 Ohms?