What is sm_z1() and sm_z2() in ADS ?

in ADS help:

sm_z1()
This complex measurement determines the impedance that must be presented to the input (port 1) of the network to achieve simultaneous input and output reflections

This complex measurement determines the impedance that must be presented to the output (port 2) of the network to achieve simultaneous input and output reflections

What's that? Is it the simultaneous i/o conjugate match?

Hi,

if the transistor is unconditionally stable, these are the impedances that should be presented at input and output of transistor to achive the maximum possible gain at particular frequency. In the same time input and output return loss will be almost zero.

flyhigh