SFG of A Source

SFG of a source is shown below:

N.B.  if Γs is 0 (which means the source impedance is Zo or 50Ωs), then

Calculate Power Waves and Generalized S-Parameters

In ADS, build a circuit and set parameters as shown below:

and simulate the circuit in 1GHz single point.


After simulation, add equations to get incident and reflected power wave:

Note, ZG and ZL should be added to the output database (in simulation control component)


The generalized S-Parameters can be readily calculated by S_Param simulation.

To verify the theory of power wave, calculate:



The results are totally in agreement with each other. Thus the power wave theory is verified.

ADS Terminator component in transient simulation

It seems that the reactive part of TERM component is ignored by ADS in transient simulation.

I simulated a very simple schematic:

the Term component here is a complex load.


However, the simulation result shows that the voltage and current are in-phase to each other, that means the reactive part of terminator is ignored

as can be seen, the magnitude of load voltage is 2.0V, and the magnitude of load current is 0.04A, so the effective load is 50Ω, not (50+j*100)Ω.

So, in order to get reactive phenomenon in transient simulation using ADS, you should explicitly add one of the two reactive components.