hi all,
I want to matching LNA for the noise,assume the Gamma(opt)=0.13/124.48,there is two matching path:from 50 Ohm to Zopt,or Zopt to 50 Ohm.In my mind,it is the different topology.and the last one is convenient and accurate to operate in smithchart.But more ducument select the first.Which one i should select?Why?
Thank you,
When you are talking about Gamma,opt, that must be Gamma,s, which related to source impedance, so the correct way is to match from 50Ohm to Gamma,opt. However, you can to it in the other way, but you have to match from conj(Gamma,opt) to 50Ohm