hello everyone, i came across a paper on distributed amplifer and they havent used any input coupling capacitor in their design. so is the design practical without using coupling capacitor. here is the link to the paper
S parameters must be calculated considering coupling capacitors, where they could be on or off chip, because S parameters performance is changed by adding an element, mainly S11 and S22 respectively. On the other hand, is your intention is to get amplifier performance, you can assume ideal capacitors, but they must be considered for physical implementation.
i m working on 0.1G to 2.7GHz, can i neglect? cuz im designing a distributed lna, and even if i add coupling capactior at input in the basic distributed topology the gain s21 gets negative,